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Файл:lab_otmp / Keil_51_v750a_OK_work / HLP / C51.pdf
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- •Chapter 1. Introduction
- •Support for all 8051 Variants
- •Books About the C Language
- •Chapter 2. Compiling with the Cx51 Compiler
- •Environment Variables
- •Running Cx51 from the Command Prompt
- •ERRORLEVEL
- •Cx51 Output Files
- •Control Directives
- •Directive Categories
- •Reference
- •Chapter 3. Language Extensions
- •Keywords
- •Memory Areas
- •Program Memory
- •Internal Data Memory
- •External Data Memory
- •Far Memory
- •Special Function Register Memory
- •Memory Models
- •Small Model
- •Compact Model
- •Large Model
- •Memory Types
- •Explicitly Declared Memory Types
- •Implicit Memory Types
- •Data Types
- •Bit Types
- •Special Function Registers
- •sbit
- •Absolute Variable Location
- •Pointers
- •Generic Pointers
- •Pointer Conversions
- •Abstract Pointers
- •Function Declarations
- •Function Parameters and the Stack
- •Passing Parameters in Registers
- •Function Return Values
- •Specifying the Memory Model for a Function
- •Specifying the Register Bank for a Function
- •Register Bank Access
- •Interrupt Functions
- •Reentrant Functions
- •Chapter 4. Preprocessor
- •Directives
- •Stringize Operator
- •Predefined Macro Constants
- •Chapter 5. 8051 Derivatives
- •Analog Devices MicroConverter B2 Series
- •Atmel 89x8252 and Variants
- •Dallas 80C320, 420, 520, and 530
- •Arithmetic Accelerator
- •Data Pointers
- •Library Routines
- •Philips 8xC750, 8xC751, and 8xC752
- •Philips 80C51MX Architecture
- •Philips and Atmel WM Dual DPTR
- •Customization Files
- •STARTUP.A51
- •INIT.A51
- •XBANKING.A51
- •Basic I/O Functions
- •Memory Allocation Functions
- •Optimizer
- •General Optimizations
- •Options for Code Generation
- •Segment Naming Conventions
- •Data Objects
- •Program Objects
- •Interfacing C Programs to Assembler
- •Function Parameters
- •Parameter Passing in Registers
- •Parameter Passing in Fixed Memory Locations
- •Function Return Values
- •Using the SRC Directive
- •Register Usage
- •Overlaying Segments
- •Example Routines
- •Small Model Example
- •Compact Model Example
- •Large Model Example
- •Data Storage Formats
- •Bit Variables
- •Signed and Unsigned Long Integers
- •Generic and Far Pointers
- •Floating-point Numbers
- •Accessing Absolute Memory Locations
- •Absolute Memory Access Macros
- •Linker Location Controls
- •The _at_ Keyword
- •Debugging
- •Chapter 7. Error Messages
- •Fatal Errors
- •Actions
- •Errors
- •Syntax and Semantic Errors
- •Warnings
- •Chapter 8. Library Reference
- •Intrinsic Routines
- •Library Files
- •Standard Types
- •va_list
- •Absolute Memory Access Macros
- •CBYTE
- •CWORD
- •DBYTE
- •DWORD
- •FARRAY, FCARRAY
- •FVAR, FCVAR,
- •PBYTE
- •PWORD
- •XBYTE
- •XWORD
- •Routines by Category
- •Buffer Manipulation
- •Character Conversion and Classification
- •Data Conversion
- •Math Routines
- •Memory Allocation Routines
- •Stream Input and Output Routines
- •String Manipulation Routines
- •Miscellaneous Routines
- •Include Files
- •8051 Special Function Register Include Files
- •ABSACC.H
- •ASSERT.H
- •CTYPE.H
- •INTRINS.H
- •MATH.H
- •SETJMP.H
- •STDARG.H
- •STDDEF.H
- •STDIO.H
- •STDLIB.H
- •STRING.H
- •Reference
- •Compiler-related Differences
- •Library-related Differences
- •Appendix B. Version Differences
- •Version 6.0 Differences
- •Version 5 Differences
- •Version 4 Differences
- •Version 3.4 Differences
- •Version 3.2 Differences
- •Version 3.0 Differences
- •Version 2 Differences
- •Appendix C. Writing Optimum Code
- •Memory Model
- •Variable Location
- •Variable Size
- •Unsigned Types
- •Local Variables
- •Other Sources
- •Appendix D. Compiler Limits
- •Appendix E. Byte Ordering
- •Recursive Code Reference Error
- •Problems Using the printf Routines
- •Uncalled Functions
- •Using Monitor-51
- •Trouble with the bdata Memory Type
- •Function Pointers
- •Glossary
- •Index
C51 Compiler |
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Standard Types
The Cx51 standard library contains definitions for a number of standard types which may be used by the library routines. These standard types are declared in include files which you may access from your C programs.
jmp_buf
The jmp_buf type is defined in SETJMP.H and specifies the buffer used by the setjmp and longjmp routines to save and restore the program environment. The jmp_buf type is defined as follows:
#define _JBLEN 7
typedef char jmp_buf[_JBLEN];
va_list
The va_list array type is defined in STDARG.H. This type holds data required by the va_arg and va_end routines. The va_list type is defined as follows:
typedef char *va_list;
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