| ??? 12/02/08 16:22 Read: times |
#160507 - a sample Responding to: ???'s previous message |
CSEG AT 000h ;reset
ljmp startup
CSEG AT 003h ;int 0
ljmp ISC_EI0
CSEG AT 00bh ;int 1
ljmp ISC_T0
CSEG AT 013h ;int 2
ljmp ISC_EI1
.....
// here switches between boot and app.
ISC_EI0: jnb GBboot,appET0 //int 0
ljmp ISR_EI0 ; bootloader ISR
appET0: ljmp APPBASE + 000h
ISC_T0: jnb GBboot,appT0 //int 1
ljmp ISR_T0 ; bootloader ISR
appT0: ljmp APPBASE + 004h
ISC_EI1: jnb GBboot,appEI1 //int 2
ljmp ISR_EI1 ; bootloader ISR
appEI1: ljmp APPBASE + 008h
......
startup:; setb GBboot
mov dptr,#0fbffh
mov a,#0
movc a,@a+dptr
jnz startAP ; if last page of flash is erased we are in app mode
ljmp ?C_STARTUP
startAP: clr GBboot
ljmp APPBASE + 060h |
| Topic | Author | Date |
| Bootloader | 01/01/70 00:00 | |
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| Thank Erik,.. | 01/01/70 00:00 | |
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| Erik's advice? | 01/01/70 00:00 | |
| How to use the code? | 01/01/70 00:00 | |
| Strong Suggestion..... | 01/01/70 00:00 |