
271
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
26.7.16
Atmel ATmega64M1 - 64K - flash boot loader parameters
ming are given.
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 26-13. Boot size configuration, ATmega64M1 (64K product).
BOOTSZ1
BOOTSZ0
Boot size
Pages
Application
flash section
Boot loader
flash section
End application
section
Boot reset address
(start boot loader
section)
1
512 words
4
0x0000 - 0x7DFF
0x7E00 - 0x7FFF
0x7DFF
0x7E00
1
0
1024 words
8
0x0000 - 0x7BFF
0x7C00 - 0x7FFF
0x7BFF
0x7C00
0
1
2048 words
16
0x0000 - 0x77FF
0x7800 - 0x7FFF
0x77FF
0x7800
0
4096 words
32
0x0000 - 0x6FFF
0x7000 - 0x7FFF
0x6FFF
0x7000
Table 26-14. Read-While-Write limit.
Section
Pages
Address
Read-While-Write section (RWW)
224
0x0000 - 0x6FFF
No Read-While-Write section (NRWW)
32
0x7000 - 0x7FFF
Variable
Corresponding
Description
PCMSB
14
Most significant bit in the Program Counter (the Program Counter is 15 bits PC[14:0])
PAGEMSB
7
Most significant bit which is used to address the words within one page (64 words in a page
requires seven bits PC [6:0])
ZPCMSB
Z15
Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB equals
PCMSB + 1
ZPAGEMSB
Z8
Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not used, the ZPAGEMSB
equals PAGEMSB + 1
PCPAGE
PC[14:7]
Z15:Z8
Program counter page address: Page select, for page erase and page write
PCWORD
PC[6:0]
Z7:Z1
Program counter word address: Word select, for filling temporary buffer (must be zero
during page write operation)