Datasheet

20
AT8xC51SND1C
4109E–8051–06/03
Figure 14. Hardware Boot Process Algorithm
The software process (boot loader) is detailed in the “Boot Loader Datasheet”
Document.
Preventing Flash
Corruption
See Section “Reset Recommendation to Prevent Flash Corruption”, page 47.
Atmel’s
Boot Loader
HardwareSoftware
Hard Cond?
ISP = L?
RESET
Hard Cond Init
ENBOOT = 1
PC = F000h
FCON = 00h
Prog Cond?
BLJB = P?
Standard Init
ENBOOT = 0
PC = 0000h
FCON = F0h
Prog Cond Init
ENBOOT = 1
PC = F000h
FCON = F0h
User’s
Application
Process Process