292
7674F–AVR–09/09
ATmega164P/324P/644P
24.8.15
ATmega324P Boot Loader Parameters
In
Table 24-7 through
Table 24-9, the parameters used in the description of the Self-Programming are given.
Note:
Note:
Note:
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
Self-Programming.
Table 24-10. Boot Size Configurat
ion 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 - 0x3EFF
0x3F00 - 0x3FFF
0x3EFF
0x3F00
1
0
512 words
8
0x0000 - 0x1DFF
0x3E00 - 0x3FFF
0x3DFF
0x3E00
0
1
1024 words
16
0x0000 - 0x1BFF
0x3C00 - 0x3FFF
0x3BFF
0x3C00
0
2048 words
32
0x0000 - 0x37FF
0x3800 - 0x3FFF
0x37FF
0x3800
Table 24-11. 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
Z-value
PCMSB
13
Most significant bit in the Program Counter. (The Program Counter is 14 bits
PC[13:0])
PAGEMSB
6
Most significant bit which is used to address the words within one page (128
words in a page requires seven bits PC [5:0]).
ZPCMSB
Z14
Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the
ZPCMSB equals PCMSB + 1.
ZPAGEMSB
Z7
Bit in Z-pointer that is mapped to PCMSB. 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)