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Московский государственный университет приборостроения и информатики

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ATmega8515(L)

Table 84. Fuse Low Byte

Fuse Low Byte	Bit no	Description	Default value

BODLEVEL	7	Brown-out Detector trigger	1	(unprogrammed)
BODLEVEL	7	level	1	(unprogrammed)
		level

BODEN	6		1	(unprogrammed, BOD
BODEN	6	Brown-out Detector enable	disabled)
		Brown-out Detector enable	disabled)

SUT1	5	Select start-up time	1	(unprogrammed)(1)
SUT0	4	Select start-up time	0	(programmed)(1)
CKSEL3	3	Select Clock source	0	(programmed)(2)
CKSEL2	2	Select Clock source	0	(programmed)(2)
CKSEL1	1	Select Clock source	0	(programmed)(2)
CKSEL0	0	Select Clock source	1	(unprogrammed)(2)

Notes: 1. The default value of SUT1..0 results in maximum start-up time. See Table 13 on page 38 for details.

2.The default setting of CKSEL3..0 results in internal RC Oscillator @ 1 MHz. See Table 5 on page 34 for details.

The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are locked if Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the Lock bits.

Latching of Fuses	The fuse values are latched when the device enters Programming mode and changes of
	the fuse values will have no effect until the part leaves Programming mode. This does
	not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses
	are also latched on Power-up in Normal mode.

Signature Bytes

Calibration Byte

All Atmel microcontrollers have a 3-byte signature code which identifies the device. This code can be read in both Serial and Parallel mode, also when the device is locked. The three bytes reside in a separate address space.

For the ATmega8515 the signature bytes are:

1.$000: $1E (indicates manufactured by Atmel).

2.$001: $93 (indicates 8KB Flash memory).

3.$002: $06 (indicates ATmega8515 device when $001 is $93).

The ATmega8515 has a one-byte calibration value for the internal RC Oscillator. This byte resides in the high byte of address $000 in the signature address space. During reset, this byte is automatically written into the OSCCAL Register to ensure correct frequency of the calibrated RC Oscillator.

The ATmega8515 stores four different calibration values for the internal RC Oscillator. These bytes resides in the signature row high byte of the addresses 0x000, 0x0001, 0x0002, and 0x0003 for 1, 2, 4, and 8 MHz respectively. During Reset, the 1 MHz value is automatically loaded into the OSCCAL Register. If other frequencies are used, the calibration value has to be loaded manually, see “Oscillator Calibration Register – OSCCAL” on page 38 for details.

179

2512G–AVR–03/05

Parallel Programming

Parameters, Pin

Mapping, and

Commands

Signal Names

This section describes how to parallel program and verify Flash Program memory, EEPROM Data memory, Memory Lock bits, and Fuse bits in the ATmega8515. Pulses are assumed to be at least 250 ns unless otherwise noted.

In this section, some pins of the ATmega8515 are referenced by signal names describing their functionality during parallel programming, see Figure 75 and Table 85. Pins not described in the following table are referenced by pin names.

The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse. The bit coding is shown in Table 87.

When pulsing WR or OE, the command loaded determines the action executed. The different Commands are shown in Table 88.

Figure 75. Parallel Programming

+5V

RDY/BSY PD1

VCC

OE PD2

PB7 - PB0 DATA

WR PD3

BS1 PD4

XA0 PD5

XA1 PD6

PAGEL PD7

+12 V RESET

BS2 PA0

XTAL1

GND

Table 85. Pin Name Mapping

Signal Name in Programming Mode

Pin Name

I/O

Function

0: Device is busy programming,

RDY/BSY

PD1

1: Device is ready for new

command

PD2

Output Enable (Active low)

PD3

Write Pulse (Active low)

BS1

PD4

Byte Select 1 (“0” selects low

byte, “1” selects high byte)

XA0

PD5

XTAL Action Bit 0

XA1

PD6

XTAL Action Bit 1

PAGEL

PD7

Program memory and EEPROM

data Page Load

BS2

PA0

Byte Select 2 (“0” selects low

byte, “1” selects 2’nd high byte)

DATA

PB7-0

I/O

Bi-directional Data bus (Output

when OE is low)

180 ATmega8515(L)

2512G–AVR–03/05

						ATmega8515(L)


Table 86. Pin Values used to Enter Programming Mode
Table 86. Pin Values used to Enter Programming Mode

		Pin			Symbol		Value

		PAGEL			Prog_enable[3]		0

		XA1			Prog_enable[2]		0

		XA0			Prog_enable[1]		0

		BS1			Prog_enable[0]		0

Table 87. XA1 and XA0 Coding

XA1		XA0		Action when XTAL1 is Pulsed

0		0		Load Flash or EEPROM Address (High or low address byte determined by
0		0		BS1)
				BS1)

0		1	Load Data (High or Low data byte for Flash determined by BS1)

1		0		Load Command

1		1		No Action, Idle

Table 88. Command Byte Bit Coding

	Command Byte				Command Executed

	1000 0000				Chip Erase

	0100 0000				Write Fuse bits

	0010 0000				Write Lock bits

	0001 0000				Write Flash

	0001 0001				Write EEPROM

	0000 1000				Read Signature Bytes and Calibration byte

	0000 0100				Read Fuse and Lock bits

	0000 0010				Read Flash

	0000 0011				Read EEPROM

Table 89. No. of Words in a Page and No. of Pages in the Flash

Flash Size	Page Size	PCWORD	No. of Pages	PCPAGE	PCMSB

4K words (8K bytes)	32 words	PC[4:0]	128	PC[11:5]	11

Table 90. No. of Words in a Page and No. of Pages in the EEPROM

EEPROM Size	Page Size	PCWORD	No. of Pages	PCPAGE	EEAMSB

512 bytes	4 bytes	EEA[1:0]	128	EEA[8:2]	8

181

2512G–AVR–03/05

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Latching of Fuses

Signature Bytes

Calibration Byte

Calibration Byte

Signal Names