| ??? 12/18/07 13:13 Read: times |
#148447 - this is strange Responding to: ???'s previous message |
IMHO, while ALE shall toggle at XTAL/6 all the time, /PSEN shall not (if /EA is at VCC). Check datasheet.
Don't you have some short from ALE to /PSEN? JW |
| Topic | Author | Date |
| Problem with ISP prog of 89c51rd2 with flashmagic | 01/01/70 00:00 | |
| check XTAL (ALE) and RESET | 01/01/70 00:00 | |
| Problem with ISP prog of 89c51rd2 with flashmagic | 01/01/70 00:00 | |
| this is strange | 01/01/70 00:00 | |
| remove 2k2 resistor | 01/01/70 00:00 | |
| tried grounding PSEN | 01/01/70 00:00 | |
| Check ALE ,also 89c51rd1 or 89v51rd2 | 01/01/70 00:00 | |
| WRONG! | 01/01/70 00:00 | |
You are Right | 01/01/70 00:00 | |
| have you read this? | 01/01/70 00:00 | |
| 89C51RD2?? | 01/01/70 00:00 |