| ??? 03/28/08 14:16 Read: times |
#152664 - only 3 empty pins while i need at least 8 o/p pins |
it's my graduation project and im running out of time...
the thing is that i need to put a self diagnostic routine that starts with the device and checks all input ports(P1 & p2). i have only 3 unused pins on p3 and my idea needs at least 8 pins. i read about using shift registers here on the site but i dont really get how i can use it or if it is going to solve my problem... so i'd really appreciate any ideas or explaination. Thnx |
| Topic | Author | Date |
| only 3 empty pins while i need at least 8 o/p pins | 01/01/70 00:00 | |
| What is it checking for Highs lows? | 01/01/70 00:00 | |
| data aquisition system of a satellite | 01/01/70 00:00 | |
| Is it really necessary? | 01/01/70 00:00 | |
| unfortunatelly it is necessary | 01/01/70 00:00 | |
| here's one way ... use it at your own risk ... | 01/01/70 00:00 | |
| the self diagnosis | 01/01/70 00:00 | |
| Correction | 01/01/70 00:00 | |
| What you should ask him is ... | 01/01/70 00:00 | |
| RE:What you should ask him is... | 01/01/70 00:00 | |
| It's not pointless, but it is costly. | 01/01/70 00:00 | |
| RE:Type of test | 01/01/70 00:00 | |
| Simple tests use loopbacks | 01/01/70 00:00 | |
| receiving inspection | 01/01/70 00:00 | |
| RE:receiving inspection | 01/01/70 00:00 | |
| You should probably do what your instructor says | 01/01/70 00:00 | |
| RE:you should probably do what the instructor says | 01/01/70 00:00 | |
| Instead the input buffers.. | 01/01/70 00:00 | |
| aside from internal memory test and port checks | 01/01/70 00:00 | |
Thank you..... | 01/01/70 00:00 |