| ??? 05/02/05 17:57 Read: times |
#92745 - A possible solution? Responding to: ???'s previous message |
If I got it right Erik, all you need is a detector - a optocoupler or a relay connected to a (interupt) input pin on your micro. The verry first line in your "main" is a check if pin x.x is high or low. If it's low, you got mains. If not you call your powerdown rutine. This dosn't solve your initial problem - the micro will still power up, when the +5V to the supervisor disapears. The stunt however forces the micro in power down again.
You should note, that you will actually run the controller on the back up source for a few cycles EVERY time the unit is powered down! I've thought about doing exactly what you did: Usig the on chip ram as non volataile, powered by a lithium cell or a supercap. Is this okay, or is there a major caveat I havnt seen? Kind regards - og ha' en god dag Per Guldmann |
| Topic | Author | Date |
| Troubles in POWER DOWN mode | 01/01/70 00:00 | |
| what's exactly the problem? | 01/01/70 00:00 | |
| the problem... | 01/01/70 00:00 | |
| that's bad... | 01/01/70 00:00 | |
| you are right... | 01/01/70 00:00 | |
| the problem | 01/01/70 00:00 | |
| A possible solution? | 01/01/70 00:00 | |
| on chip permanent storage | 01/01/70 00:00 | |
| caveat | 01/01/70 00:00 | |
| no caveat when done right | 01/01/70 00:00 | |
| 79 ? | 01/01/70 00:00 | |
| oh well | 01/01/70 00:00 | |
| caveat | 01/01/70 00:00 | |
| non-caveats | 01/01/70 00:00 | |
| "1" when v.supervisor is not powered | 01/01/70 00:00 | |
| use open pin | 01/01/70 00:00 | |
| ideas | 01/01/70 00:00 | |
| your idea... | 01/01/70 00:00 | |
| it seems to me,it is working... | 01/01/70 00:00 | |
please do not | 01/01/70 00:00 | |
| I had an idea... | 01/01/70 00:00 | |
| i tried this... | 01/01/70 00:00 | |
| wow that's bad | 01/01/70 00:00 | |
| i tried this... | 01/01/70 00:00 |