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Macro Assembler

and Utilities

Macro Assembler, Linker/Locator, Library Manager, and Object-HEX Converter for 8051, Extended 8051, and 251 Microcontrollers

User’s Guide 02.2001

2

Information in this document is subject to change without notice and does not represent a commitment on the part of the manufacturer. The software described in this document is furnished under license agreement or nondisclosure agreement and may be used or copied only in accordance with the terms of the agreement. It is against the law to copy the software on any medium except as specifically allowed in the license or nondisclosure agreement. The purchaser may make one copy of the software for backup purposes. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or information storage and retrieval systems, for any purpose other than for the purchaser’s personal use, without written permission.

Copyright © 1988-2001 Keil Elektronik GmbH., and Keil Software, Inc. All rights reserved.

Keil C51™, Keil C251™, µVision2™, and µVision2 Debugger™ are trademarks of Keil Elektronik GmbH.

Microsoft® and Windows™ are trademarks or registered trademarks of Microsoft Corporation.

Intel®, MCS® 51, MCS® 251, ASM–51®, and PL/M–51® are registered trademarks of Intel Corporation.

Every effort was made to ensure accuracy in this manual and to give appropriate credit to persons, companies, and trademarks referenced herein.

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

3

 

 

Preface

This manual describes how to use the A51, AX51, and A251 macro assemblers and the related utilities to translate assembly source code into executable programs for the 8051 and variants like the Philips 80C51MX and Intel/Atmel WM 251 devices. This manual assumes you are familiar with the Windows operating system and know how to program microcontrollers.

“Chapter 1. Introduction,” provides an overview of the different assembler variants and describes the basics of assembly language programming.

“Chapter 2. Architecture,” contains an overview of the 8051, extended 8051, Philips 80C51MX, and Intel/Atmel WM 251 devices.

“Chapter 3. Writing Assembly Programs,” describes assembler statements and the rules for arithmetic and logical expressions.

“Chapter 4. Assembler Directives,” describes how to define segments and symbols and how to use all directives.

“Chapter 5. Assembler Macros,” describes the function of the standard macros and contains information for using standard macros.

“Chapter 6. Macro Processing Language,” defines and describes the use of the Intel Macro Processing Language.

“Chapter 7. Invocation and Controls,” describes how to invoke the assembler and how to control the assembler operation.

“Chapter 8. Error Messages,” contains a list of all assembler error messages and describes their causes and how to avoid them.

“Chapter 9. Linker/Locator,” includes reference section of all linker/locater directives, along with examples and detailed descriptions.

“Chapter 10. Library Manager,” shows you how to create and maintain a library.

“Chapter 11. Object-Hex Converter,” describes how to create Intel HEX files.

The Appendix contains program examples, lists the differences between assembler versions, and contains other items of interest.

4

Preface

 

 

Document Conventions

This document uses the following conventions:

 

Examples

Description

 

 

README.TXT

Bold capital text is used for the names of executable programs, data

 

 

 

files, source files, environment variables, and commands you enter at

 

 

 

the Windows command prompt. This text usually represents commands

 

 

 

that you must type in literally. For example:

 

Courier

Variables

Elements that repeat…

Omitted code

.

.

.

Optional Items

{ opt1 | opt2 }

Keys

CLS

DIR

BL51.EXE

Note that you are not required to enter these commands using all capital letters.

Text in this typeface is used to represent information that displays on screen or prints at the printer.

This typeface is also used within the text when discussing or describing command line items.

Text in italics represents information that you must provide. For example, projectfile in a syntax string means that you must supply the actual project file name.

Occasionally, italics are also used to emphasize words in the text.

Ellipses (…) are used in examples to indicate an item that may be repeated.

Vertical ellipses are used in source code examples to indicate that a fragment of the program is omitted. For example:

void main (void) {

.

.

.

while (1);

Optional arguments in command-line and option fields are indicated by double brackets. For example:

C51 TEST.C PRINT (filename)

Text contained within braces, separated by a vertical bar represents a group of items from which one must be chosen. The braces enclose all of the choices and the vertical bars separate the choices. One item in the list must be selected.

Text in this sans serif typeface represents actual keys on the keyboard. For example, “Press Enter to continue.”

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

5

Contents

 

Chapter 1. Introduction....................................................................................

15

How to Develop A Program .......................................................................................

16

What is an Assembler?..........................................................................................

16

Modular Programming ..........................................................................................

17

Modular Program Development Process ....................................................................

19

Segments, Modules, and Programs .......................................................................

19

Translate and Link Process ...................................................................................

20

Filename Extensions .............................................................................................

22

Program Template File ...............................................................................................

23

Chapter 2. Architecture Overview ..................................................................

27

Memory Classes and Memory Layout ........................................................................

27

Classic 8051..........................................................................................................

28

Classic 8051 Memory Layout ...............................................................................

29

Extended 8051 Variants........................................................................................

30

Extended 8051 Memory Layout............................................................................

31

Philips 80C51MX .................................................................................................

32

80C51MX Memory Layout...................................................................................

33

Intel/Atmel WM 251.............................................................................................

34

251 Memory Layout..............................................................................................

35

CPU Registers.............................................................................................................

36

CPU Registers of the 8051 Variants .....................................................................

36

CPU Registers of the Intel/Atmel WM 251 ..........................................................

37

Program Status Word (PSW) ................................................................................

39

Instruction Sets ...........................................................................................................

40

Opcode Map ...............................................................................................................

64

8051 Instructions...................................................................................................

65

Additional 251 Instructions...................................................................................

66

Additional 80C51MX Instructions via Prefix A5..................................................

67

Chapter 3. Writing Assembly Programs ........................................................

69

Assembly Statements ..................................................................................................

69

Directives ..............................................................................................................

70

Controls.................................................................................................................

70

Instructions............................................................................................................

70

Comments ...................................................................................................................

71

Symbols ......................................................................................................................

72

Symbol Names ......................................................................................................

72

Labels..........................................................................................................................

73

Operands.....................................................................................................................

74

Special Assembler Symbols ..................................................................................

75

Immediate Data .....................................................................................................

76

Memory Access.....................................................................................................

76

Shaded directives and options are available only in AX51 and A251.

6

 

 

 

 

 

 

 

 

 

 

Contents

 

 

 

 

 

 

 

 

 

 

 

 

DATA....................................................................................................................

77

BIT ........................................................................................................................

77

 

EBIT (only on Intel/Atmel WM 251)

....................................................................

 

 

78

 

IDATA ..................................................................................................................

 

 

 

78

 

EDATA (Intel/Atmel WM 251, Philips 80C51MX only)

 

.....................................79

 

XDATA.................................................................................................................

 

80

CODE and

CONST

...............................................................................................

 

 

 

80

 

HDATA and HCONST

.........................................................................................

 

 

81

 

Program Addresses................................................................................................

 

 

 

82

Expressions and Operators..........................................................................................

84

Numbers ................................................................................................................

84

 

Colon Notation for Numbers (A251 only)

............................................................

85

 

Characters..............................................................................................................

 

86

Character Strings ...................................................................................................

87

Location Counter...................................................................................................

87

Operators...............................................................................................................

88

Arithmetic Operators.............................................................................................

88

Binary Operators ...................................................................................................

88

Relational Operators..............................................................................................

89

Class Operators .....................................................................................................

90

 

Type Operators

......................................................................................................

 

90

 

Miscellaneous

.......................................................................................Operators

91

Operator Precedence .............................................................................................

92

Expressions............................................................................................................

93

Expression Classes ................................................................................................

93

Relocatable Expressions........................................................................................

95

Simple Relocatable Expressions............................................................................

96

Extended Relocatable Expressions........................................................................

97

Examples with Expressions ...................................................................................

98

Chapter 4. Assembler Directives .....................................................................

99

Introduction.................................................................................................................

99

Segment Directives ...................................................................................................

102

Location Counter.................................................................................................

102

Generic Segments................................................................................................

103

Stack Segment .....................................................................................................

104

Absolute Segments ..............................................................................................

105

Default Segment ..................................................................................................

105

SEGMENT..........................................................................................................

106

RSEG...................................................................................................................

110

BSEG, CSEG, DSEG, ISEG, XSEG...................................................................

111

Symbol Definition.....................................................................................................

113

EQU, SET ...........................................................................................................

113

CODE, DATA, IDATA, XDATA.......................................................................

114

 

esfr,

...............................................................................................sfr, sfr16, sbit

116

 

LIT

(AX51 & A251 only)

..................................................................................

117

Shaded directives and options are available only in AX51 and A251.

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

7

Memory Initialization ...............................................................................................

119

DB.......................................................................................................................

 

119

DW......................................................................................................................

 

120

DD (AX51 & A251 only) ................................................................................

121

Reserving Memory....................................................................................................

122

DBIT ...................................................................................................................

 

122

DS .......................................................................................................................

 

123

DSB

(AX51 & A251 only) ..............................................................................

124

DSW

(AX51 & A251 only) .............................................................................

125

DSD

(AX51 & A251 only) ..............................................................................

126

Procedure Declaration (AX51 & A251 only) ..........................................................

127

PROC / ENDP (AX51 & A251 only) ................................................................

127

LABEL (AX51 and A251 only).......................................................................

129

Program Linkage.......................................................................................................

130

PUBLIC ..............................................................................................................

130

EXTRN / EXTERN ............................................................................................

131

NAME

.................................................................................................................

132

Address Control ........................................................................................................

133

ORG ....................................................................................................................

 

133

EVEN

(AX51 and A251 only).........................................................................

134

USING ................................................................................................................

134

Other Directives........................................................................................................

136

END ....................................................................................................................

 

136

_ _ERROR_ _ .....................................................................................................

136

Chapter 5. Assembler Macros........................................................................

137

Standard Macro Directives .......................................................................................

139

Defining a Macro......................................................................................................

140

Parameters...........................................................................................................

141

Labels..................................................................................................................

 

142

Repeating Blocks ................................................................................................

144

REPT...................................................................................................................

 

144

IRP ......................................................................................................................

 

145

IRPC....................................................................................................................

 

146

Nested Definitions...............................................................................................

147

Nested Repeating Blocks ....................................................................................

147

Recursive Macros................................................................................................

148

Operators ..................................................................................................................

 

149

NUL Operator .....................................................................................................

150

& Operator ..........................................................................................................

151

< and > Operators ...............................................................................................

152

% Operator..........................................................................................................

153

;; Operator ...........................................................................................................

154

! Operator............................................................................................................

154

Invoking a Macro......................................................................................................

155

C Macros...................................................................................................................

 

156

Shaded directives and options are available only in AX51 and A251.

8

Contents

 

 

C Macro Preprocessor Directives........................................................................

157

Stringize Operator ...............................................................................................

158

Token-pasting Operator.......................................................................................

159

Predefined C Macro Constants............................................................................

160

Examples with C Macros.....................................................................................

161

C Preprocessor Side Effects ................................................................................

162

Chapter 6. Macro Processing Language .......................................................

163

Overview...................................................................................................................

163

Creating and Calling MPL Macros ...........................................................................

164

Creating Parameterless Macros.................................................................................

164

MPL Macros with Parameters...................................................................................

166

Local Symbols List....................................................................................................

169

Macro Processor Language Functions ......................................................................

170

Comment Function ..............................................................................................

170

Escape Function ..................................................................................................

171

Bracket Function .................................................................................................

172

METACHAR Function .......................................................................................

173

Numbers and Expressions ...................................................................................

174

Numbers ..............................................................................................................

175

Character Strings .................................................................................................

176

SET Function.......................................................................................................

177

EVAL Function ...................................................................................................

178

Logical Expressions and String Comparison.......................................................

179

Conditional MPL Processing ....................................................................................

180

IF Function ..........................................................................................................

180

WHILE Function.................................................................................................

181

REPEAT Function...............................................................................................

182

EXIT Function.....................................................................................................

183

String Manipulation Functions..................................................................................

184

LEN Function......................................................................................................

184

SUBSTR Function...............................................................................................

185

MATCH Function ...............................................................................................

186

Console I/O Functions...............................................................................................

187

Advanced Macro Processing.....................................................................................

188

Literal Delimiters ................................................................................................

189

Blank Delimiters..................................................................................................

190

Identifier Delimiters ............................................................................................

191

Literal and Normal Mode ....................................................................................

192

MACRO Errors.........................................................................................................

193

Chapter 7. Invocation and Controls..............................................................

195

Environment Settings ................................................................................................

195

Running Ax51 ...........................................................................................................

196

ERRORLEVEL...................................................................................................

197

Output Files.........................................................................................................

197

Assembler Controls...................................................................................................

197

Shaded directives and options are available only in AX51 and A251.

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

9

CASE (AX51 and A251 only) ...........................................................................

200

COND / NOCOND .............................................................................................

201

DATE..................................................................................................................

 

202

DEBUG...............................................................................................................

 

203

EJECT.................................................................................................................

 

204

ERRORPRINT....................................................................................................

205

FIXDRK

(A251 only) ......................................................................................

206

GEN / NOGEN ...................................................................................................

207

INCDIR...............................................................................................................

 

208

INCLUDE ...........................................................................................................

 

209

INTR2 (A251 only)...........................................................................................

210

LIST / NOLIST...................................................................................................

211

MOD51, MOD_CONT, MOD_MX51 (AX51 only) ........................................

212

MODSRC

(A251 only) .....................................................................................

213

MPL ....................................................................................................................

 

214

NOLINES ...........................................................................................................

 

215

NOMACRO ........................................................................................................

216

NOMOD51 .........................................................................................................

217

NOSYMBOLS....................................................................................................

218

OBJECT / NOOBJECT ......................................................................................

219

PAGELENGTH, PAGEWIDTH.........................................................................

220

PRINT / NOPRINT ............................................................................................

221

REGISTERBANK / NOREGISTERBANK .......................................................

222

REGUSE.............................................................................................................

 

223

SAVE / RESTORE .............................................................................................

224

SYMLIST / NOSYMLIST..................................................................................

225

TITLE .................................................................................................................

 

226

XREF ..................................................................................................................

 

227

Controls for Conditional Assembly...........................................................................

228

Conditional Assembly Controls ..........................................................................

229

Predefined Constants (A251 only) .....................................................................

230

SET .....................................................................................................................

 

231

RESET ................................................................................................................

 

232

IF.........................................................................................................................

 

233

ELSEIF ...............................................................................................................

 

234

ELSE...................................................................................................................

 

235

ENDIF.................................................................................................................

 

236

Chapter 8. Error Messages ............................................................................

237

Fatal Errors ...............................................................................................................

 

237

Non–Fatal Errors ......................................................................................................

241

Chapter 9. Linker/Locator .............................................................................

255

Overview...................................................................................................................

 

257

Combining Program Modules .............................................................................

258

Segment Naming Conventions ............................................................................

258

Combining Segments ..........................................................................................

259

Shaded directives and options are available only in AX51 and A251.

10

Contents

 

 

Locating Segments ..............................................................................................

260

Overlaying Data Memory....................................................................................

261

Resolving External References............................................................................

261

Absolute Address Calculation .............................................................................

262

Generating an Absolute Object File ....................................................................

262

Generating a Listing File .....................................................................................

263

Bank Switching ...................................................................................................

264

Using RTX51, RTX251, and RTX51 Tiny .........................................................

265

Linking Programs......................................................................................................

266

Command Line Examples....................................................................................

268

Control Linker Input with µVision2 ....................................................................

269

ERRORLEVEL...................................................................................................

269

Output File...........................................................................................................

269

Linker/Locater Controls ......................................................................................

270

BL51 Controls.....................................................................................................

271

LX51 and L251 Controls.....................................................................................

272

Locating Programs to Physical Memory ...................................................................

273

Classic 8051 ........................................................................................................

273

Classic 8051 without Code Banking....................................................................

274

Classic 8051 with Code Banking.........................................................................

275

Extended 8051 Variants ......................................................................................

276

Philips 80C51MX................................................................................................

277

Intel/Atmel WM 251 ...........................................................................................

278

Data Overlaying ........................................................................................................

280

Program and Data Segments of Functions...........................................................

281

Using the Overlay Control...................................................................................

282

Disable Data Overlaying .....................................................................................

283

Pointer to a Function as Function Argument .......................................................

284

Pointer to a Function in Arrays or Tables............................................................

286

Tips and Tricks for Program Locating ......................................................................

289

Locate Segments with Wildcards ........................................................................

289

Special ROM Handling (LX51 & L251 only) .....................................................

290

Segment and Class Information (LX51 & L251 only).........................................

291

Use RAM for the 251 Memory Class NCONST .................................................

292

Bank Switching .........................................................................................................

293

Common Code Area ............................................................................................

293

Code Bank Areas.................................................................................................

294

Optimum Program Structure with Bank Switching .............................................

294

Program Code in Bank and Common Areas........................................................

295

Segments in Bank Areas......................................................................................

296

Bank Switching Configuration ............................................................................

297

Configuration Examples......................................................................................

299

Control Summary ......................................................................................................

305

Listing File Controls............................................................................................

306

DISABLEWARNING.........................................................................................

307

IXREF .................................................................................................................

308

Shaded directives and options are available only in AX51 and A251.

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

11

NOCOMMENTS ................................................................................................

309

NOLINES ...........................................................................................................

310

NOMAP ..............................................................................................................

311

NOPUBLICS ......................................................................................................

312

NOSYMBOLS....................................................................................................

313

PAGELENGTH / PAGEWIDTH .....................................................................

314

PRINT / NOPRINT ..........................................................................................

315

PRINTCONTROLS............................................................................................

316

PURGE ...............................................................................................................

317

WARNINGLEVEL.............................................................................................

318

Example Listing File ...........................................................................................

319

Output File Controls............................................................................................

321

ASSIGN ..............................................................................................................

322

IBANKING.........................................................................................................

323

NAME.................................................................................................................

324

NOAJMP ............................................................................................................

325

NODEBUGLINES, NODEBUGPUBLICS, NODEBUGSYMBOLS ................

326

NOINDIRECTCALL..........................................................................................

327

NOJMPTAB .......................................................................................................

328

NOTYPE.............................................................................................................

329

OBJECTCONTROLS.........................................................................................

330

Segment and Memory Location Controls............................................................

331

BANKAREA ......................................................................................................

332

BANKx ...............................................................................................................

333

BIT......................................................................................................................

334

CLASSES............................................................................................................

336

CODE..................................................................................................................

338

DATA .................................................................................................................

339

IDATA ................................................................................................................

340

NOSORTSIZE ....................................................................................................

341

PDATA ...............................................................................................................

342

PRECEDE...........................................................................................................

343

RAMSIZE ...........................................................................................................

344

RESERVE...........................................................................................................

345

SEGMENTS .......................................................................................................

346

SEGSIZE.............................................................................................................

348

STACK ...............................................................................................................

349

XDATA...............................................................................................................

350

High-Level Language Controls ...........................................................................

351

NODEFAULTLIBRARY ...................................................................................

352

NOOVERLAY....................................................................................................

353

OVERLAY..........................................................................................................

354

RECURSIONS....................................................................................................

356

REGFILE ............................................................................................................

357

RTX251, RTX51, RTX51TINY.........................................................................

358

SPEEDOVL ........................................................................................................

359

Shaded directives and options are available only in AX51 and A251.

12

Contents

 

 

Error Messages..........................................................................................................

360

Warnings .............................................................................................................

360

Non-Fatal Errors..................................................................................................

365

Fatal Errors..........................................................................................................

370

Exceptions ...........................................................................................................

375

Chapter 10. Library Manager ........................................................................

377

Using LIBx51............................................................................................................

378

Interactive Mode .................................................................................................

378

Create Library within µVision2...........................................................................

378

Command Summary..................................................................................................

379

Creating a Library ...............................................................................................

380

Adding or Replacing Object Modules.................................................................

381

Removing Object Modules..................................................................................

382

Extracting Object Modules..................................................................................

382

Listing Library Contents......................................................................................

383

Error Messages..........................................................................................................

384

Fatal Errors..........................................................................................................

384

Errors...................................................................................................................

385

Chapter 11. Object-Hex Converter ...............................................................

387

Using OHx51 ............................................................................................................

388

OHx51 Command Line Examples .......................................................................

389

Creating HEX Files for Banked Applications .....................................................

389

OHx51 Error Messages .......................................................................................

390

Using OC51 ..............................................................................................................

392

OC51 Error Messages .........................................................................................

393

Intel HEX File Format ..............................................................................................

394

Record Format.....................................................................................................

394

Data Record.........................................................................................................

395

End-of-File (EOF) Record...................................................................................

395

Extended 8086 Segment Record .........................................................................

396

Extended Linear Address Record........................................................................

396

Example Intel HEX File ......................................................................................

397

Appendix A. Application Examples...............................................................

399

ASM – Assembler Example ......................................................................................

399

Using A51 and BL51...........................................................................................

400

Using AX51 and LX51........................................................................................

401

Using A251 and L251 .........................................................................................

401

CSAMPLE – C Compiler Example...........................................................................

402

Using C51 and BL51...........................................................................................

402

Using C51 and LX51...........................................................................................

403

Using C251 and L251..........................................................................................

403

BANK_EX1 – Code Banking with C51....................................................................

404

Using C51 and BL51...........................................................................................

405

Using C51 and LX51...........................................................................................

406

Shaded directives and options are available only in AX51 and A251.

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

13

BANK_EX2 – Banking with Constants....................................................................

407

Using C51 and BL51...........................................................................................

407

Using C51 and LX51 ..........................................................................................

408

BANK_EX3 – Code Banking with PL/M-51 ...........................................................

408

Using BL51.........................................................................................................

409

Using C51 and LX51 ..........................................................................................

410

Philips 80C51MX – Assembler Example .................................................................

410

Philips 80C51MX – C Compiler Example................................................................

411

Appendix B. Reserved Symbols .....................................................................

413

Appendix C. Listing File Format...................................................................

415

Assembler Listing File Format..................................................................................

415

Listing File Heading .................................................................................................

417

Source Listing...........................................................................................................

418

Macro / Include File / Save Stack Format.................................................................

419

Symbol Table............................................................................................................

419

Listing File Trailer....................................................................................................

421

Appendix D. Assembler Differences..............................................................

423

Differences Between A51 and A251/AX51..............................................................

423

Differences between A51 and ASM51......................................................................

424

Differences between A251/AX51 & ASM51 ...........................................................

425

Glossary.............................................................................................................

427

Index..................................................................................................................

437

Shaded directives and options are available only in AX51 and A251.

14

Contents

 

 

Shaded directives and options are available only in AX51 and A251.

Keil Software — A51/AX51/A251 Macro Assembler and Utilities

15

 

 

Chapter 1. Introduction

This manual describes the macro assemblers and utilities for the classic 8051,

1

extended 8051, and 251 microcontroller families and explains the process of

developing software in assembly language for these microcontroller families.

 

 

A brief overview of the classic 8051, the extended 8051, and the 251

 

 

architectures may be found in “Chapter 2. Architecture Overview” on page 27.

 

 

In this overview, the differences between the classic 8051, the extended 8051

 

 

variants and the 251 processors are described. For the most complete

 

 

information about the microcontroller architecture refer to the hardware

 

 

reference manual of the microcontroller derivative that your are using.

 

 

For optimum support of the different 8051 and 251 variants, Keil provides the

 

 

following development tools:

 

 

 

 

 

 

 

Development Tools

Support Microcontrollers, Description

 

 

A51 Macro Assembler

Development Tools for classic 8051.

 

 

BL51 Linker/Locater

Includes support for 32 x 64KB code banks.

 

 

LIB51 Library Manager

 

 

 

AX51 Macro Assembler

Development Tools for classic and extended 8051

 

 

LX51 Extended Linker/Locater

versions (Philips 80C51MX, Dallas 390, etc.)

 

 

LIBX51 Library Manager

Supports up to 16MB code and xdata memory.

 

 

A251 Macro Assembler

Development Tools for Intel/Atmel WM 251.

 

 

L251 Linker/Locater

 

 

 

LIB251 Library Manager

 

 

 

The AX51 and A251 assemblers are supersets of the A51 assembler. This user’s guide therefore covers all development tools variants. Whenever a feature or an option is available in one specific tool chain only, it is clearly marked.

For general reference to all tool variants and microcontroller architectures the terms listed in the following table are used:

Term

Refers to …

Ax51 Macro Assembler

A51, AX51 and A251 Macro Assembler

Cx51 Compiler

C51, CX51 and C251 ANSI C Compiler

Lx51 Linker/Locator

BL51, LX51 and L251 Linker/Locator

LIBx51 Library Manager

LIB51, LIBX51 and LIB251 Library Manager

OHx51 Object-Hex Converter

OH51, OHX51 and OH251 Object-Hex Converter

x51 Architecture or x51 Device

All classic 8051, extended 8051 and 251 device variants.

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