| ??? 11/04/09 15:12 Read: times |
#170438 - Status Byte Responding to: ???'s previous message |
The "X." response suggests to me that the bootloader is indeed running. Can you connect with Flash Magic and read the value of the status byte? My guess is that somehow the status byte has become set, which will force execution of the bootloader after every reset.
Are you using an external watchdog? I believe anecdotal evidence has suggested in the past that a lack of an external watchdog with some flash based microcontrollers can cause memory corruption. I would also look at VCC, ground, etc. to make sure you are well within the limits in the data sheet and nothing is marginal. Andy |
| 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 |