| ??? 09/09/05 08:07 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#100841 - Which port? Responding to: ???'s previous message |
Which port are you using? Different ports have different electrical properties. In general all ports will sink current, so the way the LED should be wired up is from the supply through a current limiting resistor and then down to the port pin. The LED will then light when the port pin is set low. |
| Topic | Author | Date |
| 8051 port problem | 01/01/70 00:00 | |
| Which port? | 01/01/70 00:00 | |
| Port current | 01/01/70 00:00 | |
| 8051 port problem | 01/01/70 00:00 | |
| Just look at this: | 01/01/70 00:00 | |
| NPN? | 01/01/70 00:00 | |
| schmitt trigger | 01/01/70 00:00 | |
I guess you are referring to the hex | 01/01/70 00:00 | |
| Have you tried BLINK? | 01/01/70 00:00 | |
| checked the MCBx51 board | 01/01/70 00:00 | |
| Connect as shown | 01/01/70 00:00 | |
| Led problem | 01/01/70 00:00 |