| ??? 01/03/05 18:20 Read: times |
#84279 - how can i do a40kHz signal for 10 cycles |
Hi, i am quite new to the 8051 and would like some advice on setting up an output port to provide an ultrasonic transducer with a 40kHz signal for 10 cycles.
I also require rs-232 communication so i chose the 11.059MHz oscillator for the baud rates. If i use this oscillator how can i get an accurate 40kHz signal? Can i load the timer with a value of 11.5? or can i only use whole numbers? Since 11.5 x 1/(11.059MHZ/12) is 12.48uS i.e. half the period. Or can i use a 12MHz oscillator - is this still ok for the baud rates? |
| Topic | Author | Date |
| how can i do a40kHz signal for 10 cycles | 01/01/70 00:00 | |
| whole numbers | 01/01/70 00:00 | |
| baud rates | 01/01/70 00:00 | |
| CAN baud rate | 01/01/70 00:00 | |
| Tutorials and the Bible | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| Thanks for the advice | 01/01/70 00:00 | |
| Actually... | 01/01/70 00:00 | |
| And what about 2x Xtal? | 01/01/70 00:00 | |
| 40Khz for 10 cycles | 01/01/70 00:00 | |
| Run the numbers | 01/01/70 00:00 | |
or | 01/01/70 00:00 | |
| Don't forget | 01/01/70 00:00 | |
| Resonance | 01/01/70 00:00 | |
| 12MHz would not work, either | 01/01/70 00:00 | |
| 22.118MHz for signal and CAN | 01/01/70 00:00 | |
| CAN CAN | 01/01/70 00:00 | |
| CAN and 'CC02 | 01/01/70 00:00 | |
| some correction | 01/01/70 00:00 | |
| Get 40,000 kHz T2 auto reload 12 mHz | 01/01/70 00:00 | |
| sounds like an application for a PCA | 01/01/70 00:00 | |
| ... and this IS an RD2 | 01/01/70 00:00 |