| ??? 12/23/04 18:17 Modified: 12/23/04 18:21 Read: times |
#83732 - Re: Timing Problem. Responding to: ???'s previous message |
Dear Ijaz,
Thanks a lot for your reply. Are all other timings same as with previous working system? Are both micros used at either X6 or X12? Its certainly not a timing problem both the derivativs ie. P89V51RD2 and P89C668 are used in X6 mode with same 8MHz crystal on board. It doesn't seem to be a problem with LCD routines either. I tried displaying on LCD using some data in RAM that works absolutely fine with P89C668. The problem appears only when I try to display something from Internal Flash Code memory. It clearly seems to be MOVC related problem. I would like to mention that I am using Keil C for programming. With P89V51RD2 everthing works fine but with P89C668 displaying from RAM works fine but when I try to read some data from code memory and try to display it It always display 'b' irresprective of the data there. Its just a guess but I believe the problem has something to do with security bits and MOVC is not working. I tried clearing all security bits but the problem is not solved. I tried 3 diffrent virgin chips but yet no help. Regards, Prahlad Purohit |
| Topic | Author | Date |
| P89C668 MOVC problem. | 01/01/70 00:00 | |
| Earlier discussions. | 01/01/70 00:00 | |
| Timing problem? | 01/01/70 00:00 | |
| Re: Timing Problem. | 01/01/70 00:00 | |
| How do you program? | 01/01/70 00:00 | |
| Seciurity bits. | 01/01/70 00:00 | |
| A bug in the chip? | 01/01/70 00:00 | |
| Can you give the schematic ? | 01/01/70 00:00 | |
| Schematic is here. | 01/01/70 00:00 | |
| Real code I will post tomorrow. | 01/01/70 00:00 | |
| More sacrifice needed | 01/01/70 00:00 | |
| Flash Magic | 01/01/70 00:00 | |
| Flash Magic | 01/01/70 00:00 | |
| XRAM Turn ON. | 01/01/70 00:00 | |
| I missed this - Russell. | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| Caught the cause of problem. | 01/01/70 00:00 | |
256 bytes less... | 01/01/70 00:00 |