AT89C51ID2-RDTIM datasheet(125/159 Pages) ATMEL

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AT89C51ID2-RDTIM 데이터시트(PDF) 125 Page - ATMEL Corporation

125 / 159 page

125

AT89C51ID2

4289A–8051–09/03

Boot Process

Figure 49. 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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