Why is this an if write==or! O=buzzer are called

CodePudding user response:

What is P0 ^ 4 received signals? High level and low level, pulse or other signals?

CodePudding user response:

You mean the if (P0==0 xf0)
Or is the if (P0 ^ 4!
=1)If it's the latter, you is equal to the ac drives, buzzer will, of course, ring, only the frequency change