Datasheet

278
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
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
24.7.13 Boot Loader Parameters
In Table 24-6 through Table 24-8, the parameters used in the description of the self program-
ming are given.
Note: The different BOOTSZ Fuse configurations are shown in Figure 24-2.
Table 24-6. Boot Size Configuration
BOOTSZ1 BOOTSZ0
Boot
Size Pages
Application
Flash
Section
Boot
Loader
Flash
Section
End
Application
Section
Boot Reset
Address
(Start Boot
Loader
Section)
11
128
words
4
0x000 -
0xF7F
0xF80 -
0xFFF
0xF7F 0xF80
10
256
words
8
0x000 -
0xEFF
0xF00 -
0xFFF
0xEFF 0xF00
01
512
words
16
0x000 -
0xDFF
0xE00 -
0xFFF
0xDFF 0xE00
00
1024
words
32
0x000 -
0xBFF
0xC00 -
0xFFF
0xBFF 0xC00
Table 24-7. Read-While-Write Limit
Section Pages Address
Read-While-Write section (RWW) 96 0x000 - 0xBFF
No Read-While-Write section (NRWW) 32 0xC00 - 0xFFF