Rainbow Electronics Atmega169L - Manual (Page 263)

263
ATmega169V/L
2514A–AVR–08/02
ret
; 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, EEWE
rjmp Wait_ee
; SPM timed sequence
out SPMCSR, spmcrval
spm
; restore SREG (to enable interrupts if originally enabled)
out SREG, temp2
ret
ATmega169 Boot Loader
Parameters In Table 113 through Table 115, the parameters used in the description of the Self-Pro-
gramming are given.
Note: 1. The different BOOTSZ Fuse configurations are shown in Figure 116
Note: 1. For details about these two section, see “NRWW – No Read-While-Write Section” on
page 252 and “RWW – Read-While-Write Section” on page 252.
Table 113. Boot Size Configuration (1)
BOOT
SZ1
BOOTS
Z0
Boot
Size Pages
Appli-
cation
Flash
Section Boot
Loader
Flash
Section End
Appli-
cation
Section Boot Reset
Address (Start
Boot Loader
Section)
1 1 128
words
2 0x0000 -
0x1F7F 0x1F80 -
0x1FFF 0x1F7F 0x1F80
1 0 256
words
4 0x0000 -
0x1EFF 0x1F00 -
0x1FFF 0x1EFF 0x1F00
0 1 512
words
8 0x0000 -
0x1DFF 0x1E00 -
0x1FFF 0x1DFF 0x1E00
0 0 1024
words
16 0x0000 -
0x1BFF 0x1C00
-
0x1FFF 0x1BFF 0x1C00
Table 114. Read-While-Write Limit (1)
Section Pages Address
Read-While-Write section (RWW) 112 0x0000 - 0x1BFF
No Read-While-Write section (NRWW) 16 0x1C00 - 0x1FFF