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ATmega165 Datasheet(PDF) 245 Page - ATMEL Corporation

Part # ATmega165
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  336 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega165 Datasheet(HTML) 245 Page - ATMEL Corporation

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ATmega165/V
2573G–AVR–07/09
Note:
1. Z15:Z14: always ignored
Z0: should be zero for all SPM commands, byte select for the LPM instruction.
See “Addressing the Flash During Self-Programming” on page 238 for details about
the use of Z-pointer during Self-Programming.
Table 98. Explanation of different variables used in Figure 110 and the mapping to the
Z-pointer(1)
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)



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