| ??? 05/05/05 12:18 Read: times |
#92982 - could be the famous open pin Responding to: ???'s previous message |
could be the famous open pin.
Ever so many surprises" have resulted from !EA left open. That can give problems even between batches of the same chip. I am using 11.0592MHz crystal. I have tried burning the chip at both 6 and 12 clock. OR My same board works fine with the earlier lots of 89C51RD2BN I think you are missing thye difference between 'H' chips and non'H' chips For the 'H' chips you "buren" the clock mode, for the non-H youy do not. Erik |
| Topic | Author | Date |
| Problem using 89C51RD2BN | 01/01/70 00:00 | |
| Some hints... | 01/01/70 00:00 | |
| could be the famous open pin | 01/01/70 00:00 | |
| EA is tied to VCC | 01/01/70 00:00 | |
| are they H? | 01/01/70 00:00 | |
| without 'H' | 01/01/70 00:00 | |
| AN-461 | 01/01/70 00:00 | |
| I am using a parallel programmer | 01/01/70 00:00 | |
| can the chip go into ISP mode directly | 01/01/70 00:00 | |
| clear and do not fiddle | 01/01/70 00:00 | |
Thanks, it worked | 01/01/70 00:00 |