| ??? 04/18/08 20:37 Read: times |
#153691 - Which port? Responding to: ???'s previous message |
Hi Sherif!
Note that P1 to P3 (in a standard 8051) can source only few tens of uA (depends of derivative). So, even a old multimeter can load enough the P1/P3 port pins. And P0 is an "open drain" for output, and no source is possible. In both cases, if you want the use a led, connect it from Vcc to the port pin: any port can sink far more than source. |
| Topic | Author | Date |
| need help....8051 output voltages... | 01/01/70 00:00 | |
| Which port? | 01/01/70 00:00 | |
| thank Daniel but,,,, | 01/01/70 00:00 | |
| i`'m using at89c51 | 01/01/70 00:00 | |
| From the datasheet | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 | |
| made it a FAQ | 01/01/70 00:00 | |
| What? The hint to have a look at datasheet? | 01/01/70 00:00 | |
| OK I added that, too | 01/01/70 00:00 | |
| And this FAQ | 01/01/70 00:00 | |
| try this | 01/01/70 00:00 | |
| Rather useless | 01/01/70 00:00 | |
| Re-Kai Klaas | 01/01/70 00:00 | |
LED connection | 01/01/70 00:00 |