ATmega640/1280/1281/2560/2561
; return to RWW section
; verify that RWW section is safe to read
Return:
in
temp1, SPMCSR
sbrs temp1, RWWSB
ret
; If RWWSB is set, the RWW section is not ready yet
; re-enable the RWW section
ldi spmcrval, (1<<RWWSRE) | (1<<SPMEN)
call Do_spm
rjmp Return
Do_spm:
; check for previous SPM complete
Wait_spm:
in
temp1, SPMCSR
sbrc temp1, SPMEN
rjmp Wait_spm
; input: spmcrval determines SPM action
; disable interrupts if enabled, store status
in
temp2, SREG
cli
; check that no EEPROM write access is present
Wait_ee:
sbic EECR, EEPE
rjmp Wait_ee
; SPM timed sequence
out SPMCSR, spmcrval
spm
; restore SREG (to enable interrupts if originally enabled)
out SREG, temp2
ret
29.6.14 ATmega640 Boot Loader Parameters
In Table 29-7 through Table 29-9, the parameters used in the description of the Self-Program-
ming are given.
Table 29-7. Boot Size Configuration, ATmega640(Note:)
512
words
0x0000 -
0x7DFF
0x7E00 -
0x7FFF
1
1
0
0
1
0
1
0
4
8
0x7DFF
0x7BFF
0x77FF
0x6FFF
0x7E00
0x7C00
0x7800
0x7000
1024
words
0x0000 -
0x7BFF
0x7C00 -
0x7FFF
2048
words
0x0000 -
0x77FF
0x7800 -
0x7FFF
16
32
4096
words
0x0000 -
0x6FFF
0x7000 -
0x7FFF
329
2549L–AVR–08/07
ATMEL [ ATMEL ]
