| ??? 12/02/09 14:50 Read: times |
#171400 - Just use a software counter. Responding to: ???'s previous message |
Your 8051 runs at 4MHz/12 so you have a basic 3.33us clock tick.
65536 x 3.33us is 218235us or 0.22 seconds. So you only want your LED to toggle after 23 IRQs. 5.019 seconds.
if (++ctr >= 23) {
ctr = 0;
// toggle LED
}
If you want an exact 5.000 seconds then you need to adjust your Timer reload value. David. |
| Topic | Author | Date |
| Maximum Timer interrupt-89S52?? | 01/01/70 00:00 | |
| Use a variable to count number of overflows | 01/01/70 00:00 | |
Yes, the counter works! | 01/01/70 00:00 | |
| Just use a software counter. | 01/01/70 00:00 | |
| Search terms | 01/01/70 00:00 | |
| Traditional to keep track of timer reloads for slow events | 01/01/70 00:00 |