Read: 1465 times
|#190350 - PSEN outputting freq/code does not run|
I am using AT89C51, & xtal freq = 15Mhz.
1. I had checked ALE pin with CRO, it outputs: 15/5 = 2.5Mhz.
2. EA pin is +5V
3. Strange problem: PSEN pin is also outputting freq same as 2.5Mhz. So my code does not run.
I had checked for some shorting between two pins but found none.
Changed several micro but same problem.
Should I pull-up PSEN to +5V with 10K
|PSEN outputting freq/code does not run||Aamir ALi||09/16/14 11:46|
|check EA and Pgm||Jim Granville||09/16/14 17:01|
|Done checking already||Aamir ALi||09/16/14 23:07|
|dollars to doughnots I bet||Erik Malund||09/17/14 15:10|
|any other reason/remedy||Aamir ALi||09/19/14 03:25|
|Reset circuit||Mahmood Elnasser||09/19/14 14:41|
|Have you read the datasheet?||Richard Erlacher||09/20/14 17:40|