You cannot make the ALE pin | Microcontroller › 8051 › ALE pin of 89c52/52 › You cannot make the ALE pin January 20, 2012 at 9:35 am #7052 nikhiljainParticipant You cannot make the ALE pin of the microcontroller you want to use, high or low. you can make it high or low for some other microcontroller. What exactly are you trying to do?
