ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 217

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

ATmega8 Boot Loader
Parameters
2486M–AVR–12/03
In Table 82 through Table 84, the parameters used in the description of the self pro-
gramming are given.
Table 82. Boot Size Configuration
BOOTSZ1
Return:
not ready yet
Do_spm:
Wait_spm:
Wait_ee:
1
1
0
0
sbiw loophi:looplo, 1
brne Rdloop
; return to RWW section
; verify that RWW section is safe to read
in
sbrs temp1, RWWSB
ret
; re-enable the RWW section
ldi
rcallDo_spm
rjmp Return
; check for previous SPM complete
in
sbrc temp1, SPMEN
rjmp Wait_spm
; input: spmcrval determines SPM action
; disable interrupts if enabled, store status
in
cli
; check that no EEPROM write access is present
sbic EECR, EEWE
rjmp Wait_ee
; SPM timed sequence
out
spm
; restore SREG (to enable interrupts if originally enabled)
out
ret
temp1, SPMCR
spmcrval, (1<<RWWSRE) | (1<<SPMEN)
temp1, SPMCR
temp2, SREG
SPMCR, spmcrval
SREG, temp2
BOOTSZ0
1
0
1
0
Boot
Size
128
words
256
words
512
words
1024
words
Pages
16
32
4
8
Application
Flash
Section
0x000 -
0xF7F
0x000 -
0xEFF
0x000 -
0xDFF
0x000 -
0xBFF
; If RWWSB is set, the RWW section is
;use subi for PAGESIZEB<=256
Boot
Loader
Flash
Section
0xF80 -
0xFFF
0xF00 -
0xFFF
0xE00 -
0xFFF
0xC00 -
0xFFF
End
Application
Section
0xF7F
0xEFF
0xDFF
0xBFF
ATmega8(L)
Boot Reset
Address
(Start Boot
Loader
Section)
0xF80
0xF00
0xE00
0xC00
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