Blue Bridge Cup_ Single chip microcomputer_ Measure the frequency of 555

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Catalog

measurement 555 The frequency of

Conclusion of the examination

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measurement 555 The frequency of

To configure 555 Square wave generator , It can produce what the experiment needs 200Hz～20kHz The square wave signal of

 

Conclusion of the examination

• Use timer 0 Counting mode . You usually need to configure TR,CT,GATE,(CT,GATE from TMOD control )TH,TL. By timer 1, every other Read once a second TH and TL The numerical , Then clear TH and TL（ perhaps 100ms The value read in *10）, You can know the frequency .
• The counter only counts the falling edge , therefore ,555 The frequency of can be directly converted by the value of the counter . If both rising edge and falling edge technology , Then we have to /2.