Rainbow-electronics AT89C51SND1C Instrukcja Użytkownika Pobierz pdf (Strona 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

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 209 210

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Rainbow-electronics AT89C51SND1C Instrukcja Użytkownika Strona 20