
269
ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
26.7.14
Atmel ATmega16M1 - 16K - 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 26-7.
Boot size configuration, ATmega16M1 (16K product).
BOOTSZ1
BOOTSZ0
Boot size
Pages
Application
flash section
Boot loader
flash section
End application
section
Boot reset address
(start boot loader
section)
1
256 words
4
0x0000 - 0x1EFF
0x1F00 - 0x1FFF
0x1EFF
0x1F00
1
0
512 words
8
0x0000 - 0x1DFF
0x1E00 - 0x1FFF
0x1DFF
0x1E00
0
1
1024 words
16
0x0000 - 0x1BFF
0x1C00 - 0x1FFF
0x1BFF
0x1C00
0
2048 words
32
0x0000 - 0x17FF
0x1800 - 0x1FFF
0x17FF
0x1800
Table 26-8.
Read-While-Write limit.
Section
Pages
Address
Read-While-Write section (RWW)
96
0x0000 - 0x17FF
No Read-While-Write section (NRWW)
32
0x3800 - 0x1FFF
Table 26-9.
Variable
Corresponding
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)