AT89C51ID2-SLSIM Atmel, AT89C51ID2-SLSIM Datasheet - Page 125
AT89C51ID2-SLSIM
Manufacturer Part Number
AT89C51ID2-SLSIM
Description
C51ID2 64KF TWI 32KHZ PLCC44 3-5.5V IND.
Manufacturer
Atmel
Datasheet
1.AT89C51ID2-SLSIM.pdf
(157 pages)
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Boot Process
Figure 49. Bootloader Process
125
AT89C51ID2
USER APPLICATION
PC=0000h
ENBOOT=0
BLJB=1
USER BOOT LOADER
PC= [SBV]00h
BSB = 00h
SBV = FCh
FCON = 00h
condition?
Hardware
BLJB!= 0
RESET
?
?
?
?
F800h
If BLJB=0 then ENBOOT bit (AUXR1) is set
BLJB=0
ENBOOT=1
FCON = F0h
Yes (PSEN = 0, EA = 1, and ALE =1 or not connected)
FCON = 00h
yes = hardware boot
else ENBOOT bit (AUXR1) is cleared
Atmel BOOT LOADER
conditions
4289C–8051–11/05
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