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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 285 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 285 Page - ATMEL Corporation |
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285 / 386 page  285 2467S–AVR–07/09 ATmega128 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. Table 114. Explanation of Different Variables Used in Figure 134 and the Mapping to the Z- Pointer (3) Variable Corresponding Z-value Description(2) PCMSB 15 Most significant bit in the program counter. (The program counter is 16 bits PC[15:0]) PAGEMSB 6 Most significant bit which is used to address the words within one page (128 words in a page requires 7 bits PC [6:0]). ZPCMSB Z16(1) Bit in Z-register that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB equals PCMSB + 1. ZPAGEMSB Z7 Bit in Z-register that is mapped to PAGEMSB. Because Z0 is not used, the ZPAGEMSB equals PAGEMSB + 1. PCPAGE PC[15:7] Z16(1):Z8 Program counter page address: Page select, for page erase and page write PCWORD PC[6:0] Z7:Z1 Program counter word address: Word select, for filling temporary buffer (must be zero during page write operation) |
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