| ??? 04/22/10 16:57 Modified: 04/22/10 17:09 Read: times |
#175278 - comments, answers Responding to: ???'s previous message |
I am currently using 89V51RD2 with a 11.0592MHz crystal. There is an on-board serial programmer. I want to use the chip for some high frequency applications. And as there is an internal divide by 12 circuit, I get a 1.086us pulse.
"divide by 12" is T0, T1 try using T2 which also has an output pin a)I want it to be faster, so, can I simply use a crystal oscillator with a higher operating frequency? yes, up to the frequency specified as Max in the datashhet, but stay with multiples of 11.0592MHz b)Will programming the chip with a different crystal oscillator and using another for operation pose any problems? not id you stay below the frequency specified as Max in the datashhet c)Is there any practical upper limit to the frequency that the chip can work on? see a) Erik PS there is no excuse for not being familar with the datasheet for units you use. |
| Topic | Author | Date |
| crystal oscillator | 01/01/70 00:00 | |
| Research needed. | 01/01/70 00:00 | |
| comments, answers | 01/01/70 00:00 | |
| Datasheets sometimes not available | 01/01/70 00:00 | |
| Why would anyone use a part with no datasheet? | 01/01/70 00:00 | |
| I can quote you, Richard | 01/01/70 00:00 | |
| People regularly ask for help with unknown components | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| Good | 01/01/70 00:00 | |
| b) is not correct | 01/01/70 00:00 | |
| how do you manage the change of crystal?! | 01/01/70 00:00 | |
| Not really | 01/01/70 00:00 | |
| Re: Not really | 01/01/70 00:00 | |
| That's right! | 01/01/70 00:00 | |
| BAUD RATE SETTING | 01/01/70 00:00 | |
| Start a new thread! | 01/01/70 00:00 | |
| Well done! | 01/01/70 00:00 | |
| My Suggestion | 01/01/70 00:00 | |
| sum it up | 01/01/70 00:00 | |
| No, they don't | 01/01/70 00:00 | |
| I think you need some more clarification | 01/01/70 00:00 | |
There is NO need ... | 01/01/70 00:00 |