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ATmega128
Table 114. Explanation of Different Variables Used in Figure 134 and the Mapping to the Z-
Pointer (3)
Corresponding
Variable
PCMSB
15
Z-value
Description (2)
Most significant bit in the program counter. (The
program counter is 16 bits PC[15:0])
PAGEMSB
ZPCMSB
ZPAGEMSB
6
Z16 (1)
Z7
Most significant bit which is used to address the
words within one page (128 words in a page
requires 7 bits PC [6:0]).
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.
PCPAGE
PC W ORD
PC[15:7]
PC[6:0]
Z16 (1) :Z8
Z7:Z1
Program counter page address: Page select, for
page erase and page write
Program counter word address: W ord select, for
filling temporary buffer (must be zero during
page write operation)
Notes:
1. The Z-register is only 16 bits wide. Bit 16 is located in the RAMPZ register in the I/O map.
2. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction.
3. See “Addressing the Flash During Self-Programming” on page 278 for details about the use of
Z-pointer during self-programming.
285
2467X–AVR–06/11
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