| ??? 09/04/08 00:42 Modified: 09/04/08 00:46 Read: times |
#157941 - Oops... Responding to: ???'s previous message |
Alex said:
Q1)Have you checked P1.2 logic state when it is open(is it 0 or 1)
A1) I set P1.2 to 0 at the run (via software) Well, you must set it to logic high!!!!!!!!!!!!!!!!!!!!! Why don't you read the datasheet of this micro? Read chapter 4.3 on configuring Port 1 pins as inputs. We also do have a FAQ here discussing this issue in more detail: http://www.8052.com/faqs.phtml?FAQ=121619 Alex said:
Q3) Is there any pullup connected to op-amp output?
A3) Yes, 10K. I also tried with 4.7K Why a pull-up?? The LM358 contains a push-pull output stage and does not need a pull-up. But even if so, P1.2 already provides an internal pull-up. Kai |
| Topic | Author | Date |
| LM358 and 2051 | 01/01/70 00:00 | |
| What does "doesn't work" mean? | 01/01/70 00:00 | |
| Voltage level | 01/01/70 00:00 | |
| Hardly... | 01/01/70 00:00 | |
| More details. | 01/01/70 00:00 | |
| You need to make sure,.... | 01/01/70 00:00 | |
| Have u checked Pin voltage | 01/01/70 00:00 | |
| Check list | 01/01/70 00:00 | |
| Oops... | 01/01/70 00:00 | |
| Amazing.... | 01/01/70 00:00 | |
There You Go | 01/01/70 00:00 |