| ??? 04/09/05 10:28 Read: times |
#91287 - another thing Responding to: ???'s previous message |
Hemant Harish said:
I'm getting 3.3 volts for logic 1(high) and 2.5 volts for logic 0(LOW) at ports 0 and port2 (BOTH PORTS on RUGHT SIDE OF CHIP) Ijaz Ahmed said:
It seems a case of pull-ups used in wrong way, not wrong value. Another possibility: you are using an inappropriate means to measure the output voltage. If you are using a voltmeter (analogue or digital), how have you checked that the pins are really at a steady, constant level? If they are switching, or noisy, a simple voltmeter reading will be meaningless! You need to check this with an oscilloscope. Yet Another possibility: is there anything else connected to these pins? |
| Topic | Author | Date |
| at89s8252 PULL UP REQD? | 01/01/70 00:00 | |
| Pull-ups | 01/01/70 00:00 | |
| another thing | 01/01/70 00:00 | |
| uh-oh | 01/01/70 00:00 | |
| thanks | 01/01/70 00:00 | |
not 10k ?? | 01/01/70 00:00 |