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AT89C51ED2-RDTIM 数据表(PDF) 103 Page - ATMEL Corporation |
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AT89C51ED2-RDTIM 数据表(HTML) 103 Page - ATMEL Corporation |
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103 / 137 page ![]() 103 AT89C51RD2/ED2 4235E–8051–04/04 Boot Process Figure 44. Bootloader Process RESET Hardware Condition? BLJB!= 0 ? User Application FCON = 00h FCON = F0h FCON = 00h ? Atmel BOOT LOADER USER BOOT LOADER Yes = Hardware Boot F800h BLJB = 1 BSB = 00h ? SBV = FCh ? PC = 0000h PC= [SBV]00h Conditions BLJB = 0 If BLJB = 0 then ENBOOT Bit (AUXR1) is Set else ENBOOT Bit (AUXR1) is Cleared ENBOOT = 1 ENBOOT = 0 Yes (PSEN = 0, EA = 1, and ALE =1 or Not Connected) |
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