| ??? 02/14/07 14:58 Read: times |
#132908 - Sorry, I should have been more specific :) Responding to: ???'s previous message |
The burden caps should ALWAYS be the specified size, I haven't refered to cap size but their layout. I most certainly agree with 'stick to the datasheet' part about burden caps size. But, if you have them too far from mC, or just pinned in some 'plug-in' dev board with their legs at full size, then you have it's legs and all connection to mC act as antennas, effectively making your oscilation a mess... Happened to me when first time used 33pF ceramic condensators and 24MHz crtystal. Got cca 3.875 MHz oscillator... No need to tell that I've iterated my timer vaues in order to have anything received to hyperteminal, since I've (naturally) suspected serial/mC rather than my messy oscilator :) Thanks for clarification, Erik, Best luck, CN |
| Topic | Author | Date |
| problem in connecting 89c51rd2 to computer | 01/01/70 00:00 | |
| Some help | 01/01/70 00:00 | |
| Checklist? | 01/01/70 00:00 | |
| Caslav is missing the 'typical' case | 01/01/70 00:00 | |
| Sorry, I should have been more specific :) | 01/01/70 00:00 | |
| then the burden caps is not your problem | 01/01/70 00:00 | |
| Don't these cables need some tiebacks? | 01/01/70 00:00 | |
| this depends on the COM port settings... | 01/01/70 00:00 | |
| No | 01/01/70 00:00 | |
| Handshake doesn't appear in the document | 01/01/70 00:00 | |
| OK, "flow control"... | 01/01/70 00:00 | |
| any help with 89c51rd2fn programming?? | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| @site administrator | 01/01/70 00:00 | |
But, what was the solution?? | 01/01/70 00:00 | |
| Buy 89c51rd2 Kit | 01/01/70 00:00 | |
| from Phytec | 01/01/70 00:00 |