not included in the Read Program Memory instruction. The extended address byte is
stored until the command is re-issued, i.e., the command needs only be issued for the
first page, and when crossing the 64KWord boundary.
7. At the end of the programming session, RESET can be set high to commence normal
operation.
8. Power-off sequence (if needed):
Set RESET to “1”.
Turn VCC power off.
Table 30-16. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location
Symbol
Minimum Wait Delay
4.5 ms
tWD_FLASH
tWD_EEPROM
tWD_ERASE
9.0 ms
9.0 ms
30.8.3
Serial Programming Instruction set
Table 30-17 on page 354 and Figure 30-10 on page 356 describes the Instruction set.
Table 30-17. Serial Programming Instruction Set
Instruction Format
Instruction/Operation
Byte 1
$AC
Byte 2
Byte 3
$00
Byte4
$00
Programming Enable
$53
$80
$00
Chip Erase (Program Memory/EEPROM)
Poll RDY/BSY
$AC
$00
$00
$F0
$00
data byte out
Load Instructions
Load Extended Address byte(1)
Load Program Memory Page, High byte
Load Program Memory Page, Low byte
Load EEPROM Memory Page (page access)
Read Instructions
$4D
$48
$40
$C1
$00
$00
$00
$00
Extended adr
adr LSB
$00
high data byte in
low data byte in
data byte in
adr LSB
0000 000aa
Read Program Memory, High byte
Read Program Memory, Low byte
Read EEPROM Memory
Read Lock bits
$28
$20
$A0
$58
$30
$50
$58
$50
$38
adr MSB
adr MSB
0000 aaaa
$00
adr LSB
adr LSB
aaaa aaaa
$00
high data byte out
low data byte out
data byte out
data byte out
data byte out
data byte out
data byte out
data byte out
data byte out
Read Signature Byte
$00
0000 000aa
$00
Read Fuse bits
$00
Read Fuse High bits
$08
$00
Read Extended Fuse Bits
Read Calibration Byte
$08
$00
$00
$00
Write Instructions
354
ATmega640/1280/1281/2560/2561
2549L–AVR–08/07
ATMEL [ ATMEL ]
