| ??? 08/27/06 18:48 Read: times |
#123149 - p0 initialised as input port Responding to: ???'s previous message |
Port 0 is externally pulled high and it is initialised as input(mov p0,#0ffh) at reset. The actual key scan has a debounce of 16ms, once a key press has been detected, the value of the pressed key is temporaryly stored in a register and only then will the code enter this subroutine seeking for multiple taps/presses within 423ms. |
| 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 |