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Beginners ask for help! ! 20KHZ square wave is generated by 5 1 single chip microcomputer. I don't know why the simulation results can't be obtained.
Program department

sbit？ P 1 _ 0 = P 1 0 write

sbit？ p 1_0=p 1^0； ?

Besides, yes. You didn't turn on the virtual oscilloscope in proteus, did you? 50us per grid, just 20kHZ.

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