| ??? 03/11/07 09:15 Modified: 03/11/07 09:27 Read: times |
#134703 - interesting they may be, Responding to: ???'s previous message |
Mike Stegmaier said:
The only way I can verify the eeprom with the circuit is to disable the reset. (MANR is high).
I even tried somple code, like this: mov DPTR,FF00h mov A,38h movx @dptr,A This code is supposed to make the LCD go blank as soon as the reset pin on the microprocessor goes low. Remember, this circuit is supposed to let me program the EEPROM and use it without removing it. but you stil failed to answer following: have you been able to read your eeprom and verify that what you think you wrote to it, is actually present in the EEPROM? Please don't tell me you cannot remove your EEPROM from your circuit... Failing any other test method, you can always drive the address lines manualy and verify the code presented at the data lines. (ie single stepping your code in the eeprom). You will have to verify each programmed location to see if it matches what you want it to be. Well, the above would be what I would do next. regards Patrick |
| Topic | Author | Date |
| 8051 board somewhat working | 01/01/70 00:00 | |
| Give us a clue then.How does it partialy work?? | 01/01/70 00:00 | |
| HC AC ???? | 01/01/70 00:00 | |
| you will most likely need pullups | 01/01/70 00:00 | |
| pull ups | 01/01/70 00:00 | |
| be more specific | 01/01/70 00:00 | |
| interesting tests | 01/01/70 00:00 | |
| interesting they may be, but | 01/01/70 00:00 | |
| to verify | 01/01/70 00:00 | |
| interesting they may be, | 01/01/70 00:00 | |
| Checksum? CRC? | 01/01/70 00:00 | |
| hmm | 01/01/70 00:00 | |
| You probably need an oscilloscope | 01/01/70 00:00 | |
| sorry for asking | 01/01/70 00:00 | |
| not the first... (or last :-) | 01/01/70 00:00 | |
| Maybe my naging helped ... | 01/01/70 00:00 | |
| why EPP? | 01/01/70 00:00 | |
| why epp can be faster | 01/01/70 00:00 | |
| Epp requires a bit less logic and is WAY faster | 01/01/70 00:00 | |
| about that schematic ... | 01/01/70 00:00 | |
| a matter of taste | 01/01/70 00:00 | |
| I have to agree ... | 01/01/70 00:00 | |
you may not have discovered this | 01/01/70 00:00 | |
| you have to investigate | 01/01/70 00:00 | |
| indeed | 01/01/70 00:00 | |
| Amazed! | 01/01/70 00:00 | |
| What? | 01/01/70 00:00 |