Datasheet

Table 31-6. Boot Size Configuration, ATmega88PA
BOOTSZ1 BOOTSZ0 Boot
Size
Pages Application
Flash Section
Boot
Loader
Flash
Section
End
Application
Section
Boot Reset
Address
(Start Boot
Loader
Section)
1 1 128
words
4 0x000 - 0xF7F 0xF80 -
0xFFF
0xF7F 0xF80
1 0 256
words
8 0x000 - 0xEFF 0xF00 -
0xFFF
0xEFF 0xF00
0 1 512
words
16 0x000 - 0xDFF 0xE00 -
0xFFF
0xDFF 0xE00
0 0 1024
words
32 0x000 - 0xBFF 0xC00 -
0xFFF
0xBFF 0xC00
Note: The different BOOTSZ Fuse configurations are shown in Figure 31-2.
Table 31-7. Read-While-Write Limit, ATmega88PA
Section Pages Address
Read-While-Write section (RWW) 96 0x000 - 0xBFF
No Read-While-Write section (NRWW) 32 0xC00 - 0xFFF
For details about these two section, please refer to 31.4.2 No Read-While-Write (NRWW) Section and
31.4.1 Read-While-Write (RWW) Section.
Table 31-8. Explanation of Different Variables used in Figure 31-3
Variable Corresponding
Z-value
(1)
Description
PCMSB 11 Most significant bit in the Program Counter. (The Program
Counter is 12 bits PC[11:0])
PAGEMSB 4 Most significant bit which is used to address the words within
one page (32 words in a page requires 5 bits PC [4:0]).
ZPCMSB Z12 Bit in Z-register that is mapped to PCMSB. Because Z0 is not
used, the ZPCMSB equals PCMSB + 1.
ZPAGEMSB Z5 Bit in Z-register that is mapped to PAGEMSB. Because Z0 is
not used, the ZPAGEMSB equals PAGEMSB + 1.
PCPAGE PC[11:5] Z12:Z6 Program counter page address: Page select, for page erase
and page write
PCWORD PC[4:0] Z5:Z1 Program counter word address: Word select, for filling
temporary buffer (must be zero during page write operation)
Note: 1. Z15:Z13: always ignored
ATmega48PA/88PA/168PA
Boot Loader Support – Read-While-Write Self-...
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