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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega328P датащи(PDF) 291 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 291 Page - ATMEL Corporation |
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291 / 448 page  291 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P 26.8.16 ATmega328P Boot Loader Parameters In Table 26-13 through Table 26-15, the parameters used in the description of the self programming are given. Note: The different BOOTSZ Fuse configurations are shown in Figure 26-2 on page 280. For details about these two section, see ”NRWW – No Read-While-Write Section” on page 278 and ”RWW – Read-While- Write Section” on page 278. Note: 1. Z15: 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 282 for details about the use of Z-pointer during Self- Programming. Table 26-13. Boot Size Configuration, ATmega328P BOOTSZ1 BOOTSZ0 Boot Size Pages Application Flash Section Boot Loader Flash Section End Application Section Boot Reset Address (Start Boot Loader Section) 1 1 256 words 4 0x0000 - 0x3EFF 0x3F00 - 0x3FFF 0x3EFF 0x3F00 1 0 512 words 8 0x0000 - 0x3DFF 0x3E00 - 0x3FFF 0x3DFF 0x3E00 0 1 1024 words 16 0x0000 - 0x3BFF 0x3C00 - 0x3FFF 0x3BFF 0x3C00 0 0 2048 words 32 0x0000 - 0x37FF 0x3800 - 0x3FFF 0x37FF 0x3800 Table 26-14. Read-While-Write Limit, ATmega328P Section Pages Address Read-While-Write section (RWW) 224 0x0000 - 0x37FF No Read-While-Write section (NRWW) 32 0x3800 - 0x3FFF Table 26-15. Explanation of Different Variables used in Figure 26-3 and the Mapping to the Z-pointer, ATmega328P Variable Corresponding Z-value(1) Description PCMSB 13 Most significant bit in the Program Counter. (The Program Counter is 14 bits PC[13:0]) PAGEMSB 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 Z14 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[13:6] Z14: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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