| ??? 10/05/09 14:56 Read: times |
#169438 - Please pardon my ignorance Responding to: ???'s previous message |
But I'm just a hobbiest and fairly new to electronics at that. I have no idea what check-summing is or how/why to implement it. Basically the plan was to use a capacitor to store enough juice to run the 8051 for a couple of milliseconds and use one of the interrupt pins and a diode to sense when the voltage on the other side of the diode dropped out an put the 8051 into power down mode in the interrupt service routine. Thereafter, only the 8051 would receive voltage from the battery. If the data gets corrupted, the only consequence is that it stops working right and has to be rewritten I suppose... not like it's going in a pace-maker or something like that. |
| Topic | Author | Date |
| A few questions about internal RAM | 01/01/70 00:00 | |
| questions | 01/01/70 00:00 | |
| through everything | 01/01/70 00:00 | |
| oops | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| I'm writing in asm | 01/01/70 00:00 | |
| EEPROM | 01/01/70 00:00 | |
| then RAM is NOT cleared on reset | 01/01/70 00:00 | |
| RE: RAM is NOT cleared on reset. | 01/01/70 00:00 | |
| nothing in the code | 01/01/70 00:00 | |
| RAM indeterminate after a hardware reset | 01/01/70 00:00 | |
| Great | 01/01/70 00:00 | |
| Good checksumming | 01/01/70 00:00 | |
| Please pardon my ignorance | 01/01/70 00:00 | |
| Knowing if initial contents is initialized or not. | 01/01/70 00:00 | |
| Battery-backed microcontroller | 01/01/70 00:00 | |
| Just use an 8051 with eeprom | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 | |
| alternatives | 01/01/70 00:00 | |
| Not just "alternative" - but "superior"! | 01/01/70 00:00 | |
| Great suggestions | 01/01/70 00:00 | |
that depends | 01/01/70 00:00 |