| ??? 10/26/10 13:28 Read: times |
#179352 - RC Responding to: ???'s previous message |
Hi Richard,
I agree completely with you. The old RC reset circuit can cause some problems. This is the old design (2004) which worked in a field for several years. The voltage supervisor chip (TI TPS3824-50DBVR) is used in the design’s reset circuitry. The chip is supplied with DCDC converter over the isolation. The original chip P89C51RD2 is replaced with P89V51RD2. I had some functionality to add. I needed to detect difference between power up reset and a forced reset. It seems that POF flag doesn't work. Thanks, g |
| Topic | Author | Date |
| P89V51 power up | 01/01/70 00:00 | |
| are you missing this? | 01/01/70 00:00 | |
| POF flag | 01/01/70 00:00 | |
| 'V' in the name is not revision... | 01/01/70 00:00 | |
| What is your VCC ramp? | 01/01/70 00:00 | |
| Power UP | 01/01/70 00:00 | |
| I've been harping on this for years ... | 01/01/70 00:00 | |
| Not nobody | 01/01/70 00:00 | |
| RC | 01/01/70 00:00 | |
| Have you considered the effect of Vcc rise/fall time? | 01/01/70 00:00 | |
| Vcc rise/fall time | 01/01/70 00:00 | |
Try trick | 01/01/70 00:00 |