| ??? 08/25/08 09:17 Read: times |
#157726 - Obvious Reason Responding to: ???'s previous message |
Dear Priyam,
Have a look at your exo_isr. It says something like this void ex0_isr (void) interrupt 0 { if(l1 == 1) on led else off led } also by defination l1 is p3.2 (i.e. int0 pin) is it really necessary to check pin to glow led (if PC reached int0 isr, what does it means?) Main reason why led is not going off everytime is obvious, you are checking pin after entering isr, but check compilers output (many compilers does a lot of pushing etc... before actually starting with your code) Find out for time duration of the -ve pulses. Most probably the pin goes to logic 1 before PC reaching jb / jnb 0xB2, rel Regards, Mahesh |
| Topic | Author | Date |
| pls help....8051 external interrupts | 01/01/70 00:00 | |
| show definition of "a" variable | 01/01/70 00:00 | |
| definiton : sbit a=P3^2; | 01/01/70 00:00 | |
| Need more information | 01/01/70 00:00 | |
| the entire code | 01/01/70 00:00 | |
| keyscan | 01/01/70 00:00 | |
| How the LED are connected? | 01/01/70 00:00 | |
| One tip | 01/01/70 00:00 | |
| P3.2= iNT0 | 01/01/70 00:00 | |
| P3.2= INT0 | 01/01/70 00:00 | |
| pin 3.2 | 01/01/70 00:00 | |
| P3.2= INT0..1 | 01/01/70 00:00 | |
| Obvious Reason | 01/01/70 00:00 | |
| time duration | 01/01/70 00:00 | |
| mistake | 01/01/70 00:00 | |
| ok thanks alot | 01/01/70 00:00 | |
| ? | 01/01/70 00:00 | |
| GATE0/1 ? | 01/01/70 00:00 | |
| no | 01/01/70 00:00 | |
| try | 01/01/70 00:00 | |
| Debounce maybe? | 01/01/70 00:00 | |
| Solution | 01/01/70 00:00 | |
| interrupt flag bit clear | 01/01/70 00:00 | |
Detecting Both Edges - A very old trick | 01/01/70 00:00 |