| ??? 11/04/09 08:27 Read: times |
#170408 - P89C51RD fail to enter ISP mode |
Hello,
It's my first message in this forum. Some years ago, we developed a product integrating P89C51RD2. This product is in production for a long time without any problem, but for some time our customers send back to us cards which present trouble in the course of use to them. After analysis, I noticed that the signal TXD follows RXD as if P89C51RD2 was enter in test mode or in echo mode ; our application does not arrange this mode of functioning. How is it possible to go into this mode? The customer has no possibility to reprogram our product in ISP mode ; no on-site programming. Other signals seem OK: PSEN, RESET, P2.6, P2.7, VCC Best regards, Pascal |
| Topic | Author | Date |
| P89C51RD fail to enter ISP mode | 01/01/70 00:00 | |
| is it in ISP mode? | 01/01/70 00:00 | |
| #170409 - is it in ISP mode? | 01/01/70 00:00 | |
| what is exactly the response? | 01/01/70 00:00 | |
| Echo X | 01/01/70 00:00 | |
| Status Byte | 01/01/70 00:00 | |
| Status Byte | 01/01/70 00:00 | |
I second | 01/01/70 00:00 | |
| Have you posted it on NXP Forum ? | 01/01/70 00:00 | |
| No, I havent posted it on NXP Forum ! | 01/01/70 00:00 | |
| Then Please Do That | 01/01/70 00:00 | |
| Cross-posting | 01/01/70 00:00 | |
| the NXP forum is dead... | 01/01/70 00:00 | |
| not quite, more like in a coma | 01/01/70 00:00 | |
| 'C51-related fora | 01/01/70 00:00 |