Rainbow-electronics ATmega162V Manual de usuario descargar pdf (Pagina 229)

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101

229

ATmega162/V

2513E–AVR–09/03

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 222 for details about

the use of Z-pointer during Self-programming.

Table 96. Explanation of Different Variables Used in Figure 95 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])

PAG EM S B

5 Most significant bit which is used to address

the words within one page (64 words in a page

requires 6 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 PCMSB.

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)

1 2 ... 224 225 226 227 228 229 230 231 232 233 234 ... 322 323

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