My customer have found a symptom that a ground level of the P0.1 pin was floated in ADuC7023 as shown below.
P0.1 PIN - GPIO input configuration, 10Kohm pull-up resister
If she offers a DC signal directly through a switch, the above symptom do not occur.
Please advice what is the cause of the above symptom? How does she correct it?
Thanks in advance.