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AT90USB646 Datasheet(PDF) 365 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 365 Page - ATMEL Corporation |
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365 / 459 page  365 7593H–AVR–11/08 ATmega32U6/AT90USB64/128 Note: 1. Z0: should be zero for all SPM commands, byte select for the (E)LPM instruction. See “Addressing the Flash During Self-Programming” on page 357 for details about the use of Z-pointer during Self-Programming. Table 28-10. Explanation of different variables used in Figure 28-4 and the mapping to the Z- pointer Variable Corresponding Z-value Description (1) PCMSB 16 Most significant bit in the Program Counter. (The Program Counter is 17 bits PC[16:0]) PAGEMSB 6 Most significant bit which is used to address the words within one page (128 words in a page requires seven bits PC [6:0]). ZPCMSB Z17 Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the ZPCMSB equals PCMSB + 1. ZPAGEMSB Z7 Bit in Z-pointer that is mapped to PCMSB. Because Z0 is not used, the ZPAGEMSB equals PAGEMSB + 1. PCPAGE PC[16:7] Z17: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) 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 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:Z7 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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