89C51IC2-CM ATMEL [ATMEL Corporation], 89C51IC2-CM Datasheet - Page 115

• Manufacturer Part Number: 89C51IC2-CM
• Description: 8-bit Flash Microcontroller with 2-wire Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Boot Process
Figure 46. Bootloader process
4301A–8051–01/04
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
AT89C51IC2
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