| ??? 08/27/06 17:30 Modified: 08/27/06 17:36 Read: times |
#123141 - You should see the connection... Responding to: ???'s previous message |
Ashwin said:
But i don't see the connection, what is that got to do with the code not comming out of the delay loop? Without pull-ups and with deactivated open-drain outputs (remember, Port 0 does only provide open-drain outputs, but no internal active pull-ups, and can only turn-off the open-drain outputs when emitting high state!) the potential at the column inputs can drift to low state, which would result in a leaving of your scanning routine "KONFIRM_KEY_PRESS", just what you observe... Means, the micro assumes that some key is pressed all the time, although it is not. What did you write into P0, earlier? Kai |
| Topic | Author | Date |
| problem with delays | 01/01/70 00:00 | |
| Omitted pull-ups at Port 0? | 01/01/70 00:00 | |
| No, it's pulled high | 01/01/70 00:00 | |
| You should see the connection... | 01/01/70 00:00 | |
| could it be your approach? | 01/01/70 00:00 | |
| p0 initialised as input port | 01/01/70 00:00 | |
| post the WHOLE code | 01/01/70 00:00 | |
| WHOLE code | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| WHOLE code | 01/01/70 00:00 | |
| Assuming that the external pullups are not working | 01/01/70 00:00 | |
| why is the delay not being excecuted? | 01/01/70 00:00 | |
| HOW DO YOU KNOW | 01/01/70 00:00 | |
| Through debugging | 01/01/70 00:00 | |
| I know nothing about keil debugger | 01/01/70 00:00 | |
| make code that resembles the flowchart and you wil | 01/01/70 00:00 | |
| whole? | 01/01/70 00:00 | |
| Ashwins stack handling is totally unsuited! | 01/01/70 00:00 | |
| to generate tone of octave(8keys)with 89c51 | 01/01/70 00:00 | |
sandy please start a new thread | 01/01/70 00:00 |