| ??? 02/14/05 17:30 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#87401 - 3 levels possible on 8051 without buffer Responding to: ???'s previous message |
To get 0, +2.5 and +5V with an 8051 do the following:
+5V | 10K | |------- p0.x I/O and output to LCD backplane | 10K | -------- p0.y I/O To get 0V, pull P0.x low To get 2.5V pull p0.y low, p0.x high To get +5V leave both p0.x and p0.y high Regards, Bert van den Berg |
| Topic | Author | Date |
| three level output with resistors | 01/01/70 00:00 | |
| Buffer your pins... | 01/01/70 00:00 | |
| the advantage of '51 | 01/01/70 00:00 | |
| Try ATmega8515 | 01/01/70 00:00 | |
| or try a modern '51 | 01/01/70 00:00 | |
| ... and are not pin compatible... | 01/01/70 00:00 | |
| pin-compatible but reset is negative | 01/01/70 00:00 | |
| What is less pain? | 01/01/70 00:00 | |
| not any more | 01/01/70 00:00 | |
| where do you get your info? | 01/01/70 00:00 | |
| the horses mouth | 01/01/70 00:00 | |
| hmmmm | 01/01/70 00:00 | |
| pico gates, | 01/01/70 00:00 | |
| if just one unit or maybe | 01/01/70 00:00 | |
| 3 levels possible on 8051 without buffer | 01/01/70 00:00 | |
| the goalpost | 01/01/70 00:00 | |
| gotcha | 01/01/70 00:00 | |
The solution, but ... (almost off topic) | 01/01/70 00:00 | |
| A possible solution | 01/01/70 00:00 | |
| deja vu? | 01/01/70 00:00 | |
| Whoops! | 01/01/70 00:00 | |
| flat style | 01/01/70 00:00 | |
| aka | 01/01/70 00:00 | |
| R-2R | 01/01/70 00:00 | |
| R-2R? | 01/01/70 00:00 |