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

Part # AT89C51ID2-RDTIM
Description  8-bit Flash Microcontroller
PDF  159 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM Datasheet(HTML) 125 Page - ATMEL Corporation

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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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