ATmega64A datasheet(313/392 Pages) ATMEL

313 / 392 page

313

8160C–AVR–07/09

ATmega64A

Table 27-15. SPI Serial Programming Instruction Set

Instruction

Instruction Format

Operation

Byte 1

Byte 2

Byte 3

Byte4

Programming Enable

1010 1100

0101 0011

xxxx xxxx

Enable SPI Serial Programming

after RESET goes low.

Chip Erase

1010 1100

100x xxxx

xxxx xxxx

Chip Erase EEPROM and Flash.

Read Program Memory

0010 H000

xaaa aaaa

bbbb bbbb

oooo oooo

Read H (high or low) data o from

Program memory at word address

a:b.

Load Program Memory

Page

0100 H000

xxxx xxxx

xbbb bbbb

iiii iiii

Write H (high or low) data i to

Program Memory page at word

address b. Data low byte must be

loaded before data high byte is

applied within the same address.

Write Program Memory

Page

0100 1100

xaaa aaaa

bxxx xxxx

xxxx xxxx

Write Program Memory Page at

address a:b.

Read EEPROM Memory

1010 0000

xxxx xaaa

bbbb bbbb

oooo oooo

Read data o from EEPROM

memory at address a:b.

Write EEPROM Memory

1100 0000

xxxx xaaa

bbbb bbbb

iiii iiii

Write data i to EEPROM memory

at address a:b.

Read Lock Bits

0101 1000

0000 0000

xxxx xxxx

xxoo oooo

Read Lock bits. “0” = programmed,

“1” = unprogrammed. See Table

27-1 on page 295 for details.

Write Lock Bits

1010 1100

111x xxxx

xxxx xxxx

11ii iiii

Write Lock bits. Set bits = “0” to

program Lock bits. See Table 27-1

on page 295 for details.

Read Signature Byte

0011 0000

xxxx xxxx

xxxx xxbb

oooo oooo

Read Signature Byte o at address

Write Fuse Bits

1010 1100

1010 0000

xxxx xxxx

iiii iiii

Set bits = “0” to program, “1” to

unprogram. See Table 27-5 on

page 297 for details.

Write Fuse High Bits

1010 1100

1010 1000

xxxx xxxx

iiii iiii

Set bits = “0” to program, “1” to

unprogram. See Table 27-4 on

page 297 for details.

Write Extended Fuse Bits

1010 1100

1010 0100

xxxx xxxx

xxxx xxii

Set bits = “0” to program, “1” to

unprogram. See Table 27-5 on

page 297 for details.

Read Fuse Bits

0101 0000

0000 0000

xxxx xxxx

oooo oooo

Read Fuse bits. “0” = programmed,

“1” = unprogrammed. See Table

27-5 on page 297 for details.

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