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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT83SND2CMP3B датащи(PDF) 21 Page - ATMEL Corporation |
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AT83SND2CMP3B датащи(HTML) 21 Page - ATMEL Corporation |
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21 / 241 page  21 4341F–MP3–03/06 AT8xC51SND2C/MP3B 6.4.2 Hardware Condition Boot Mapping The hardware condition is based on the ISP pin. When driving this pin to low level, the chip reset sets ENBOOT and forces the reset vector to F000h instead of 0000h in order to execute the boot loader software. As shown in Figure 6-4 the hardware condition always allows in-system recovery when user’s memory has been corrupted. 6.4.3 Programmed Condition Boot Mapping The programmed condition is based on the Boot Loader Jump Bit (BLJB) in HSB. As shown in Figure 6-4 when this bit is programmed (by hardware or software programming mode), the chip reset set ENBOOT and forces the reset vector to F000h instead of 0000h, in order to execute the boot loader software. Figure 6-4. Hardware Boot Process Algorithm The software process (boot loader) is detailed in the “Boot Loader Datasheet” Document. 6.5 Preventing Flash Corruption See Section “Reset Recommendation to Prevent Flash Corruption”, page 48. Atmel’s Boot Loader Hard Cond? ISP = L? RESET Hard Cond Init ENBOOT = 1 PC = F000h FCON = 00h Prog Cond? BLJB = P? Standard Init ENBOOT = 0 PC = 0000h FCON = F0h Prog Cond Init ENBOOT = 1 PC = F000h FCON = F0h User’s Application |
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