| ??? 12/22/06 12:57 Read: times |
#129991 - at 89S52 chip acting unreliably Responding to: ???'s previous message |
thank you ......... didn't expect such prompt reply
1. i am using a crude RC ckt ...... as you said ....... what is the other ckt is it a RC connected to a Schmitt trigger ......... 2. is it possible for the crystal to work above its rated speed .... if so how can that be tested ... i don't have ready access to a CRO ..... somewhere i read a speaker ckt can be hooked up to a CRYSTAL and based on the sound the ckt can be tested ( the passage was about using logic probe to test fast changing port pin ) but does anyone know how exactly to go about this ......... Thank you .................... |
| Topic | Author | Date |
| at 89S52 chip acting unreliably | 01/01/70 00:00 | |
| LCD reset | 01/01/70 00:00 | |
| Processor Reset | 01/01/70 00:00 | |
| at 89S52 chip acting unreliably | 01/01/70 00:00 | |
| no oscilloscope, use LED | 01/01/70 00:00 | |
| Proper Reset - not RC! | 01/01/70 00:00 | |
| make reset "hybrid" chip with opamp | 01/01/70 00:00 | |
| that is plain crazy | 01/01/70 00:00 | |
| allmost crazy | 01/01/70 00:00 | |
| Why take the risk? | 01/01/70 00:00 | |
| use a proper supervisor chip | 01/01/70 00:00 | |
| Thank you | 01/01/70 00:00 | |
| What a supervisor does | 01/01/70 00:00 | |
| Keyboard problem? | 01/01/70 00:00 | |
| Re. Keyboard problem? | 01/01/70 00:00 | |
| RC | 01/01/70 00:00 | |
evrything you wanted to ask about RC reset... | 01/01/70 00:00 |