| ??? 02/02/05 08:15 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#86350 - bad things Responding to: ???'s previous message |
hi,
Mehdi said:
END_ISR:
POP 7 POP 7 POP 7 Why do you pop up 3 values? Return address takes only two bytes on the stack. Anyway, there is general mistake in your logic: an interrupt may occure at any time and so you may not be sure about how much values are placed on the stack when ISR runs. I mean that an interrupt may be called inside main loop as well as inside the deepest subroutine. So, if you really need with bad things you do, then reload stack value as well! Something like that: END_ISR: MOV SP,#default_value MOV R7,#50H PUSH 7 MOV R7,#0H PUSH 7 SETB P3.3 RETI Regards, Oleg |
| Topic | Author | Date |
| Hanging Up My 8051? | 01/01/70 00:00 | |
| an ISR returns to where it happened | 01/01/70 00:00 | |
| correction | 01/01/70 00:00 | |
| Re:hanging up my 8051. | 01/01/70 00:00 | |
| no such assumption | 01/01/70 00:00 | |
| 2 things | 01/01/70 00:00 | |
| experience is not everything! | 01/01/70 00:00 | |
somebody like you! | 01/01/70 00:00 | |
| If you know exactly what you do... | 01/01/70 00:00 | |
| he is going to do it | 01/01/70 00:00 | |
| The rare case | 01/01/70 00:00 | |
| bad things | 01/01/70 00:00 | |
| On reloading default (e.g. SP) | 01/01/70 00:00 | |
| Thanks Oleg | 01/01/70 00:00 |