| ??? 10/08/03 16:09 Read: times |
#56333 - RE: using T0 and TI pins and internal timer Responding to: ???'s previous message |
If you think that internal RAM of 89C51 would suffice to hold the data you need, - feed the 89c51 over a diod. - let a 2500 MF cap. charged from pin 40 of 89c51 over a 1K res. - detect the power_down. - immediately set the controller to Power_Down mode. If you use C, modify the startup file not to clear the RAM area where you resided your data after restart. My experiments prove that 2-3 days data retention provided with this way. Rustu |
| Topic | Author | Date |
| using T0 and TI pins and internal timer | 01/01/70 00:00 | |
| RE: using T0 and TI pins and internal timer | 01/01/70 00:00 | |
| RE: using T0 and TI pins and internal timer | 01/01/70 00:00 | |
| RE: using T0 and TI pins and internal timer | 01/01/70 00:00 | |
| thanks a lot but problems still there | 01/01/70 00:00 | |
| RE: thanks a lot but problems still there | 01/01/70 00:00 | |
| RE: thanks a lot but problems still there | 01/01/70 00:00 | |
| some more inputs to the problem | 01/01/70 00:00 | |
| RE: some more inputs to the problem | 01/01/70 00:00 | |
RE: some more inputs to the problem | 01/01/70 00:00 |