253
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Note:
Note:
1. Z15:Z14: always ignored.
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
Self-Programming.
26.8.14
Boot Loader Parameters (Atmel ATmega325A/325PA/3250A/3250PA/625A/645P/6450A/6450P)
given.
Note:
Table 26-7.
Read-While-Write limit
(1) (Atmel ATmega165A/ATmega165PA).
Section
Pages
Address
Read-While-Write section (RWW)
112
0x0000 - 0x1BFF
No Read-While-Write section (NRWW)
16
0x1C00 - 0x1FFF
Table 26-8.
pointer
(1) (ATmega165A/ATmega165PA).
Variable
Corresponding Z-value
Description
PCMSB
12
Most significant bit in the Program Counter. (The Program Counter is
13 bits PC[12:0])
PAGEMSB
5
Most significant bit which is used to address the words within one
page (64 words in a page requires six bits PC [5:0])
ZPCMSB
Z13
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used,
the ZPCMSB equals PCMSB + 1
ZPAGEMSB
Z6
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not
used, the ZPAGEMSB equals PAGEMSB + 1
PCPAGE
PC[12:6]
Z13:Z7
Program Counter page address: Page select, for Page Erase and
Page Write
PCWORD
PC[5:0]
Z6:Z1
Program Counter word address: Word select, for filling temporary
buffer (must be zero during Page Write operation)
Table 26-9.
Boot Size configuration
(1) (ATmega325A/325PA/3250A/3250PA/625A/645P/6450A/6450P).
BOOTSZ1
BOOTSZ0
Boot size
Pages
Application
Flash section
Boot Loader
Flash section
End
Application
section
Boot Reset
Address
(start Boot
Loader section)
1
256/512 words
4
0x0000-0x3EFF/
0x0000-0x7DFF
0x3F00-0x3FFF/
0x7E00-0x7FFF
0x3EFF/
0x7DFF
0x3F00/
0x7E00
1
0
512/1024 words
8
0x0000-0x3DFF/
0x0000-0x7BFF/
0x3E00-0x3FFF/
0x7C00-0x7FFF
0x3DFF/
0x7BFF
0x3E00/
0x7C00
0
1
1024/2048 words
16
0x0000-0x3BFF/
0x0000-0x77FF
0x3C00-0x3FFF/
0x7800-0x7FFF
0x3BFF/
0x77FF
0x3C00/
0x7800
0
2048/4096 words
32
0x0000-0x37FF/
0x0000-0x6FFF
0x3800-0x3FFF/
0x7000-0x7FFF
0x37FF/
0x6FFF
0x3800/
0x7000