ATmega8U2/16U2/32U2
Table 25-16. Serial Programming Instruction Set
Instruction Format
Byte 2 Byte 3
Instruction
Byte 1
Byte4
Operation
1010 1100 0101 0011 xxxx xxxx xxxx xxxx Enable Serial Programming after
Programming Enable
Chip Erase
RESET goes low.
1010 1100 100x xxxx xxxx xxxx xxxx xxxx Chip Erase EEPROM and Flash.
0100 1101 0000 0000 cccc cccc xxxx xxxx Defines Extended Address Byte for
Read Program Memory and Write
Load Extended Address Byte
Read Program Memory
Program Memory Page.
0010 H000 aaaa aaaa bbbb bbbb oooo oooo Read H (high or low) data o from
Program memory at word address
c:a:b.
0100 H000 xxxx 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 aaaa aaaa bbxx xxxx xxxx xxxx Write Program Memory Page at
address c:a:b.
Write Program Memory Page
Read EEPROM Memory
Write EEPROM Memory
1010 0000 0000 aaaa bbbb bbbb oooo oooo Read data o from EEPROM memory at
address a:b.
1100 0000 0000 aaaa bbbb bbbb iiii iiii Write data i to EEPROM memory at
address a:b.
1100 0001 0000 0000 0000 00bb iiii iiii Load data i to EEPROM memory page
Load EEPROM Memory
Page (page access)
buffer. After data is loaded, program
EEPROM page.
Write EEPROM Memory
Page (page access)
1100 0010 0000 aaaa bbbb bb00 xxxx xxxx
Write EEPROM page at address a:b.
0101 1000 0000 0000 xxxx xxxx xxoo oooo Read Lock bits. “0” = programmed, “1”
= unprogrammed. See Table 25-1 on
Read Lock bits
Write Lock bits
page 246 for details.
1010 1100 111x xxxx xxxx xxxx 11ii iiii Write Lock bits. Set bits = “0” to
program Lock bits. See Table 25-1 on
page 246 for details.
Read Signature Byte
Write Fuse bits
0011 0000 000x 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.
1010 1100 1010 1000 xxxx xxxx iiii iiii Set bits = “0” to program, “1” to
Write Fuse High bits
unprogram.
1010 1100 1010 0100 xxxx xxxx iiii iiii Set bits = “0” to program, “1” to
Write Extended Fuse Bits
unprogram. See Table 25-3 on page
247 for details.
0101 0000 0000 0000 xxxx xxxx oooo oooo Read Fuse bits. “0” = programmed, “1”
Read Fuse bits
= unprogrammed.
0101 1000 0000 1000 xxxx xxxx oooo oooo Read Fuse High bits. “0” = pro-
Read Fuse High bits
grammed, “1” = unprogrammed.
262
7799D–AVR–11/10
ATMEL [ ATMEL ]
