Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 174)

174

ATmega8515(L)

2512A–AVR–04/02

Note: 1. Z15:Z13: always ignored.

Z0:should be zero for all SPMcommands, byte select for the LPM instruction.

See “Addressing the Flash During Self-Programming” on page 167 fordetails about

theuseofZ-pointerduring Self-Programming.

Table 80. Explanation ofDifferent Variables used in Figure 73 and the Mapping to the

Z-pointer

(1)

Variable

Corresponding

Z-value Description

PCMSB 11 Most significant bit in theProgram Counter.

(TheProgram Counter is 12 bits PC[11:0])

PAGEMSB 4 Most significant bit which is used to address

the words within one page (32 words in a page

requiresfive bits PC[4:0]).

ZPCMSB Z12 Bit in Z-register that is mapped to PCMSB.

Because Z0is not used, the ZPCMSB equals

PCMSB + 1.

ZPAGEMSB Z5 Bit in Z-register that is mapped to PCMSB.

Because Z0is not used, the ZPAGEMSB

equals PAGEMSB + 1.

PCPAGE PC[11:5]Z12:Z6 Program Counterpage address: Page select,

for Page Eraseand Page Write

PCWORD PC[4:0]Z5:Z1Program Counterword address: Word select,

forfilling temporary buffer(must be zero during

Page Write operation)

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Rainbow-electronics ATmega8515L Manual do Utilizador Página 174