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ATmega128
Table 129. SPI Serial Programming Instruction Set
Instruction Format
Instruction
Programming Enable
Byte 1
1010 1100
Byte 2
0101 0011
Byte 3
xxxx xxxx
Byte 4
xxxx xxxx
Operation
Enable SPI Serial Programming after RESET
goes low.
Chip Erase
Read Program
1010 1100
0010 H 000
100x xxxx
aaaa aaaa
xxxx xxxx
bbbb bbbb
xxxx xxxx
oooo oooo
Chip Erase EEPROM and Flash.
Read H (high or low) data o from Program
Memory
memory at word address a : b .
Load Program
0100 H 000
xxxx xxxx
x bbb bbbb
iiii iiii
W rite H (high or low) data i to Program
Memory Page
Memory page at word address b . Data low
byte must be loaded before data high byte is
applied within the same address.
W rite Program
0100 1100
aaaa aaaa
b xxx xxxx
xxxx xxxx
Memory Page
W rite Program Memory Page at address a : b .
Read EEPROM
1010 0000
xxxx aaaa
bbbb bbbb
oooo oooo
Read data o from EEPROM memory at
Memory
address a : b .
W rite EEPROM
1100 0000
xxxx aaaa
bbbb bbbb
iiii iiii
W rite data i to EEPROM memory at address
Memory
a : b .
Read Lock bits
0101 1000
0000 0000
xxxx xxxx
xx oo oooo
Read Lock bits. “0” = programmed, “1” =
unprogrammed. See Table 115 on page
286 for details.
W rite Lock bits
1010 1100
111x xxxx
xxxx xxxx
11 ii iiii
W rite Lock bits. Set bits = “0” to program Lock
bits. See Table 115 on page 286 for details.
Read Signature Byte
W rite Fuse bits
0011 0000
1010 1100
xxxx xxxx
1010 0000
xxxx xx bb
xxxx xxxx
oooo oooo
iiii iiii
Read Signature Byte o at address b .
Set bits = “0” to program, “1” to unprogram.
See Table 119 on page 288 for details.
W rite Fuse High Bits
1010 1100
1010 1000
xxxx xxxx
iiii iiii
Set bits = “0” to program, “1” to unprogram.
See Table 118 on page 288 for details.
W rite Extended Fuse
1010 1100
1010 0100
xxxx xxxx
xxxx xx ii
Set bits = “0” to program, “1” to unprogram.
bits
See Table 119 on page 288 for details.
Read Fuse bits
0101 0000
0000 0000
xxxx xxxx
oooo oooo
Read Fuse bits. “0” = programmed, “1” =
unprogrammed. See Table 119 on page
288 for details.
Read Extendend
0101 0000
0000 1000
xxxx xxxx
oooo oooo
Read Extended Fuse bits. “0” = pro-grammed,
Fuse bits
“1” = unprogrammed. See Table 119 on
page 288 for details.
Read Fuse High Bits
0101 1000
0000 1000
xxxx xxxx
oooo oooo
Read Fuse high bits. “0” = pro-grammed, “1” =
unprogrammed. See Table 118 on page
288 for details.
Read Calibration Byte
0011 1000
xxxx xxxx
0000 00 bb
oooo oooo
Read Calibration Byte o at address b .
Note:
a = address high bits
b = address low bits
H = 0 - Low byte, 1 - High Byte
o = data out
i = data in
x = don’t care
304
2467X–AVR–06/11
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