ATmega32(L)
Table 115. SPI Serial Programming Instruction Set
Instruction Format
Byte 2 Byte 3
Instruction
Byte 1
Byte4
Operation
1010 1100 0101 0011 xxxx xxxx xxxx xxxx Enable SPI Serial Programming after
Programming Enable
Chip Erase
RESET goes low.
1010 1100 100x xxxx xxxx xxxx xxxx xxxx Chip Erase EEPROM and Flash.
0010 H000 00aa aaaa bbbb bbbb oooo oooo Read H (high or low) data o from
Program memory at word address a:b.
Read Program Memory
0100 H000 00xx xxxx xxbb 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.
Load Program Memory Page
0100 1100 00aa aaaa bbxx xxxx xxxx xxxx Write Program Memory Page at
address a:b.
Write Program Memory Page
Read EEPROM Memory
Write EEPROM Memory
1010 0000 00xx xxaa bbbb bbbb oooo oooo Read data o from EEPROM memory at
address a:b.
1100 0000 00xx xxaa bbbb bbbb iiii iiii Write data i to EEPROM memory at
address a:b.
0101 1000 0000 0000 xxxx xxxx xxoo oooo Read Lock bits. “0” = programmed, “1”
= unprogrammed. See Table 102 on
Read Lock Bits
page 256 for details.
1010 1100 111x xxxx xxxx xxxx 11ii iiii Write Lock bits. Set bits = “0” to
program Lock bits. See Table 102 on
Write Lock Bits
page 256 for details.
Read Signature Byte
Write Fuse Bits
0011 0000 00xx xxxx xxxx xxbb oooo oooo Read Signature Byte o at address b.
1010 1100 1010 0000 xxxx xxxx iiii iiii Set bits = “0” to program, “1” to
unprogram. See Table 105 on page
258 for details.
1010 1100 1010 1000 xxxx xxxx iiii iiii Set bits = “0” to program, “1” to
Write Fuse High Bits
Read Fuse Bits
unprogram. See Table 104 on page
257 for details.
0101 0000 0000 0000 xxxx xxxx oooo oooo Read Fuse bits. “0” = programmed, “1”
= unprogrammed. See Table 105 on
page 258 for details.
0101 1000 0000 1000 xxxx xxxx oooo oooo Read Fuse high bits. “0” = pro-
grammed, “1” = unprogrammed. See
Read Fuse High Bits
Read Calibration Byte
Table 104 on page 257 for details.
0011 1000 xxxx xxxx 0000 00bb 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
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2503J–AVR–10/06
ATMEL [ ATMEL ]
