
270
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
26.7.15
Atmel ATmega32M1 - 32K - flash boot loader parameters
Notes:
2. One word equals two bytes.
Note:
1. Z15:Z13: always ignored.
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
Programming.
Table 26-10. Boot size configuration, ATmega32M1 (32K product).
BOOTSZ1
BOOTSZ0
Pages
Application
flash section
Boot loader
flash section
End application
section
Boot reset address
(start boot loader
section)
1
256 words
4
0x0000 - 0x3EFF
0x3F00 - 0x3FFF
0x3EFF
0x3F00
1
0
512 words
8
0x0000 - 0x3DFF
0x3E00 - 0x3FFF
0x3DFF
0x3E00
0
1
1024 words
16
0x0000 - 0x3BFF
0x3C00 - 0x3FFF
0x3BFF
0x3C00
0
2048 words
32
0x0000 - 0x37FF
0x3800 - 0x3FFF
0x37FF
0x3800
Table 26-11. Read-While-Write Limit
Section
Pages
Address
Read-While-Write section (RWW)
224
0x0000 - 0x37FF
No Read-While-Write section (NRWW)
32
0x3800 - 0x3FFF
Variable
Corresponding
Description
PCMSB
13
Most significant bit in the Program Counter (the Program Counter is 14 bits PC[13:0])
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
Z14
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[13:6]
Z14: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)