ATMEGA169 ATMEL [ATMEL Corporation], ATMEGA169 Datasheet - Page 264

• Manufacturer Part Number: ATMEGA169
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

ATmega169 Boot Loader
Parameters
264
ATmega169/V
In Table 113 through Table 115, the parameters used in the description of the Self-Pro-
gramming are given.
Table 113. Boot Size Configuration
Note:
Table 114. Read-While-Write Limit
Note:
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Do_spm:
Wait_spm:
Wait_ee:
1
1
0
0
ret
; re-enable the RWW section
ldi
call Do_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
1. The different BOOTSZ Fuse configurations are shown in Figure 117
1. For details about these two section, see “NRWW – No Read-While-Write Section” on
page 253 and “RWW – Read-While-Write Section” on page 253.
spmcrval, (1<<RWWSRE) | (1<<SPMEN)
temp1, SPMCSR
temp2, SREG
SPMCSR, spmcrval
SREG, temp2
1
0
1
0
words
words
words
words
1024
128
256
512
(1)
(1)
16
2
4
8
0x0000 -
0x1F7F
0x0000 -
0x1EFF
0x0000 -
0x1DFF
0x0000 -
0x1BFF
Pages
112
16
0x1F80 -
0x1FFF
0x1F00 -
0x1FFF
0x1E00 -
0x1FFF
0x1C00 -
0x1FFF
Address
0x0000 - 0x1BFF
0x1C00 - 0x1FFF
0x1F7F
0x1EFF
0x1DFF
0x1BFF
2514P–AVR–07/06
0x1F80
0x1F00
0x1E00
0x1C00