| ??? 05/19/10 22:55 Read: times |
#176041 - Baud RateTolerance? |
Hi,
Setting-up a serial port for a particular Baud rate often involves a small error. A given crystal frequency and calculated hardware re-load value may produce a Baud rate with a slight variation to that required. My question is, what is an acceptable percentage of error in Baud rate calculation, that may be used to establish the reliability in use, of a particular serial port set-up? I'm sure there is a long-winded technical explaination of how such a communications parameter may be derived, but I'm more interested in what works 100% in practice. What's your experience? Regards, Murray R. Van Luyn. |
| Topic | Author | Date |
| Baud RateTolerance? | 01/01/70 00:00 | |
| acceptable baud-rate error | 01/01/70 00:00 | |
| 100% ?? | 01/01/70 00:00 | |
| 2.5% | 01/01/70 00:00 | |
| whoa!! | 01/01/70 00:00 | |
| I prefer < 0.5% | 01/01/70 00:00 | |
| the method | 01/01/70 00:00 | |
| skew/asymmetry | 01/01/70 00:00 | |
| Asymmetry | 01/01/70 00:00 | |
| ZERO | 01/01/70 00:00 | |
| So do I... | 01/01/70 00:00 | |
| Not always possible to select crystal just for UART | 01/01/70 00:00 | |
| In reference to the above: | 01/01/70 00:00 | |
| Thank you all. | 01/01/70 00:00 | |
| Try a test with a PC and Sqr Sig Gen | 01/01/70 00:00 | |
| likely a wromg approach | 01/01/70 00:00 | |
| Maxim AN-2141 | 01/01/70 00:00 | |
link and comment | 01/01/70 00:00 |