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AT89C51ED2-RDTIM Datasheet(PDF) 103 Page - ATMEL Corporation

Part # AT89C51ED2-RDTIM
Description  8-bit Flash Microcontroller
PDF  137 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Datasheet(HTML) 103 Page - ATMEL Corporation

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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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