ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 279

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

8285D–AVR–06/11
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Table 26-7.
Note:
Table 26-8.
Note:
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
1. For details about these two section, see
1. Z15:Z14: always ignored
267
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See
Z-pointer during Self-Programming.
Read-While-Write Limit
Explanation of different variables used in
pointer
and
PC[12:6]
”Addressing the Flash During Self-Programming” on page 272
PC[5:0]
12
5
”RWW – Read-While-Write Section” on page
(1)
(ATmega165A/ATmega165PA)
Corresponding
Z-value
Z13:Z7
Z6:Z1
Z13
Z6
(1)
(ATmega165AATmega165PA)
Most significant bit in the Program Counter. (The
Program Counter is 13 bits PC[12:0])
Most significant bit which is used to address the words
within one page (64 words in a page requires six bits PC
[5:0]).
Bit in Z-register that is mapped to PCMSB. Because Z0
is not used, the ZPCMSB equals PCMSB + 1.
Bit in Z-register that is mapped to PAGEMSB. Because
Z0 is not used, the ZPAGEMSB equals PAGEMSB + 1.
Program Counter page address: Page select, for Page
Erase and Page Write
Program Counter word address: Word select, for filling
temporary buffer (must be zero during Page Write
operation)
”NRWW – No Read-While-Write Section” on page
Pages
112
16
Figure 26-3
267.
Description
and the mapping to the Z-
Address
0x0000 - 0x1BFF
0x1C00 - 0x1FFF
for details about the use of
279