| ??? 06/01/06 15:50 Read: times |
#117541 - Not at all Responding to: ???'s previous message |
Arvind said:
Is 0 and 1 depend on the common anode and common cathode ... ??? It totally and only depends on your actual driver circuit! You can make a LED go on with emitting logic low, when the anode is connected to Vcc (via current limiting resistor) and the cathode is connected to according port line. But you can also drive a npn-transistor with the port line, to let the LED current flow to ground via collector emitter path. In this case you need logic high at port line to turn-on the transistor and by this the LED. So, the actual logic state at port line doesn't tell you anything. Only in combination with actual driver circuit this makes sense. Kai |
| Topic | Author | Date |
| 7 segment display | 01/01/70 00:00 | |
| Basics | 01/01/70 00:00 | |
| More guidelines | 01/01/70 00:00 | |
| More Basics | 01/01/70 00:00 | |
| Not at all | 01/01/70 00:00 | |
per-pin, per-port, and whole-chip limits | 01/01/70 00:00 | |
| some of the answers? | 01/01/70 00:00 | |
| Didn't search first | 01/01/70 00:00 | |
| Quiz question | 01/01/70 00:00 | |
| answer | 01/01/70 00:00 | |
| it's usually a background task | 01/01/70 00:00 | |
| Yes, but... | 01/01/70 00:00 | |
| It's a good place to start. | 01/01/70 00:00 | |
| Base on posts, timing seems to be | 01/01/70 00:00 | |
| Timing | 01/01/70 00:00 | |
| Yes, it looks like homework | 01/01/70 00:00 |