
293
8018P–AVR–08/10
ATmega169P
Note:
Note:
1. Z15:Z14: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
Z-pointer during Self-Programming.
Table 26-7.
Read-While-Write Limit
Section
Pages
Address
Read-While-Write section (RWW)
112
0x0000 - 0x1BFF
No Read-While-Write section (NRWW)
16
0x1C00 - 0x1FFF
Table 26-8.
ping to the Z-pointer
Variable
Corresponding
Z-value
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)