| ??? 06/19/12 09:39 Read: times |
#187787 - RE Responding to: ???'s previous message |
i take for a short time a positive pulse(from the latch outputs and from the high address port) at the same time.
In the assembly program i have programmed already a pin . From this pin i do not take anything. My rs232 communication works fine with working circuits. It seems that the MC is frozen. Crystal output ok, ALE ok. In the circuits that have this problem, the MAX307 is also destroyed(the reset is always active) or its output is lower than its supply. So, when the supply is 5v i should take 5V, but i measure 4V. The circuit does not differ from a circuit that exist in many books, unfortunately i work in small company and i take it in paper. Thank you for your attention |
| Topic | Author | Date |
| circuit repair, high level of all adress bytes | 01/01/70 00:00 | |
| what's on P2 is not that intersting initially, ... | 01/01/70 00:00 | |
| oszi daten | 01/01/70 00:00 | |
| depends on the app, but still | 01/01/70 00:00 | |
| we'll need a schematic, I believe. | 01/01/70 00:00 | |
| general guidelines | 01/01/70 00:00 | |
| RE | 01/01/70 00:00 | |
| Hardware check | 01/01/70 00:00 | |
| anyhow this begs a question | 01/01/70 00:00 | |
| Replay | 01/01/70 00:00 | |
| It wouldn't hurt to know how you've connected your hardware | 01/01/70 00:00 | |
| new | 01/01/70 00:00 | |
| Just curious... | 01/01/70 00:00 | |
I have to agree with Hal, it can't be done ... | 01/01/70 00:00 |