| ??? 01/25/05 01:53 Read: times |
#85718 - Power on reset Responding to: ???'s previous message |
If I am to understand the problem correctly - on power-up everything is ok, but when reset is pressed, the display goes into a 'coma'. If this is the case - the lcd has it's own power-up reset, when you do a manual reset, the lcd is still initialised but may have been interrupted in a command when the manual reset occurred. Therefore you need to ensure as part of your lcd initialisation that the lcd controller is in a known state. Did I make this clear? There is a similar issue when using standard character lcds in 4bit mode - the data sheet specifies an initialisation sequence to ensure the lcd is in a certain state - ignore the special sequence and the display will work from power up but not manual reset. |
| Topic | Author | Date |
| Strange Reset Problem | 01/01/70 00:00 | |
| Is it RC circuit | 01/01/70 00:00 | |
| No RC | 01/01/70 00:00 | |
| Reset Switch Issue | 01/01/70 00:00 | |
| a possibility | 01/01/70 00:00 | |
| No Luck! | 01/01/70 00:00 | |
| Glitches? | 01/01/70 00:00 | |
| I can guess what may be wrong if... | 01/01/70 00:00 | |
| try this | 01/01/70 00:00 | |
| PCB is the only suspect left! | 01/01/70 00:00 | |
| EMI problem | 01/01/70 00:00 | |
which derivative | 01/01/70 00:00 | |
| Power on reset | 01/01/70 00:00 | |
| Is there reset input? | 01/01/70 00:00 | |
| doesn't matter | 01/01/70 00:00 | |
| But what is the problem? | 01/01/70 00:00 | |
| just fixed similar | 01/01/70 00:00 | |
| sounds like wiring problem | 01/01/70 00:00 | |
| It wouldn't be would it? | 01/01/70 00:00 | |
| But Mahmood said, it's not the LCD! | 01/01/70 00:00 |