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i have connected key to port 1.7 of 89s52, with a pull up resistor of 3.3k and 0.1uf capacitro to ground. The key does not work. If i replace 89s52 with 89c52 the key do not functions as desired.
i could not find out why and. I have searched in many forums for the answer.
help now pleez
Too urgent to bother with minor little details like selecting the correct architecture, then?