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AT89C51ED2-RDTUM Datasheet(PDF) 101 Page - ATMEL Corporation

Part # AT89C51ED2-RDTUM
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-RDTUM Datasheet(HTML) 101 Page - ATMEL Corporation

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101
4235K–8051–05/08
AT89C51RD2/ED2
24.6.5
Boot Process
Figure 24-5. Bootloader Process
RESET
Hardware
Condition?
BLJB!= 0
?
User Application
Atmel BOOT LOADER
USER BOOT LOADER
BLJB = 1
BSB = 00h
?
SBV = FCh
?
PC = 0000h
PC= [SBV]00h
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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