| ??? 06/04/10 08:29 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#176379 - Calculations for Timer T0 at 8KHz: have you tried 0xFF8D ??? Responding to: ???'s previous message |
Timer T0 should be loaded with the negative number of the calculations
because it ticks up till overflow, so : 11059200 / 12 cycles = 921600 921600 / 8000 = 115.2 round to 115 65536 - 115 = 65421 or 0xFF8D reload values TL0 = 0x0D; TH0 = 0xFF; Try this reload values and the T0 ISR will tick aprox at 8KHz K.L.Angelis |
| Topic | Author | Date |
| 80C52 Timer0 | 01/01/70 00:00 | |
| where is the EA initialize? | 01/01/70 00:00 | |
| EA initialize | 01/01/70 00:00 | |
| no reason in what you show | 01/01/70 00:00 | |
| TL0 and TH0 | 01/01/70 00:00 | |
| Calculations for Timer T0 at 8KHz: have you tried 0xFF8D ??? | 01/01/70 00:00 | |
| correction | 01/01/70 00:00 | |
| Yeah - 0x8D | 01/01/70 00:00 | |
| Thanks for that typo, More for 8KHz with 50% duty cycle | 01/01/70 00:00 | |
| Put the compiler to work... | 01/01/70 00:00 | |
| fine, but | 01/01/70 00:00 | |
| T0 overflows at 65535+1, don't overlook this | 01/01/70 00:00 | |
| right answer, wrong premise | 01/01/70 00:00 | |
| Exact calculations require semantics | 01/01/70 00:00 | |
| you are welcome to find out | 01/01/70 00:00 | |
Thanks for the correction... | 01/01/70 00:00 |