| ??? 05/10/07 09:06 Read: times |
#138972 - Remember that P0 needs pullups? Responding to: ???'s previous message |
May be (without seeing your schematics) you forgot that P0, used as a I/O port, is open drain, and needs a pullup resistor. |
| Topic | Author | Date |
| 4 *3 keypad interfacing | 01/01/70 00:00 | |
| Details | 01/01/70 00:00 | |
| Remember that P0 needs pullups? | 01/01/70 00:00 | |
| here is schematic! | 01/01/70 00:00 | |
| Not there! | 01/01/70 00:00 | |
| under what name did you upload that? | 01/01/70 00:00 | |
| 89s52 instead of ds5000t | 01/01/70 00:00 | |
start a new thread | 01/01/70 00:00 | |
| not a big problem | 01/01/70 00:00 |