Datasheet

Table 27-7. Boot Size Configuration, ATmega16M1
BOOTSZ1 BOOTSZ0 Boot
Size
Pages Application
Flash Section
Boot
Loader
Flash
Section
End
Application
Section
Boot Reset
Address
(Start Boot
Loader
Section)
1 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 0 2048
words
32 0x0000 -
0x17FF
0x1800 -
0x1FFF
0x17FF 0x1800
Note: The different BOOTSZ Fuse configurations are shown in Figure 27-2.
Table 27-8. Read-While-Write Limit, ATmega16M1
Section Pages Address
Read-While-Write section (RWW) 96 0x0000 - 0x17FF
No Read-While-Write section (NRWW) 32 0x3800 - 0x1FFF
For details about these two sections, please refer to NRWW – No Read-While-Write Section and RWW –
Read-While-Write Section.
Table 27-9. Explanation of Different Variables used in Figure 27-3
Variable Corresponding
Z-value
(1)
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 6 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)
Note: 1. Z15:Z13: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
Atmel ATmega16M1/32M1/64M1 [DATASHEET]
Atmel-8209F-ATmega16M1/32M1/64M1_Datasheet_Complete-10/2016
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