The use of timer/counter measure motor speed. Use a timer T1 (regular time of 50 milliseconds), T0 as a counter (count pulse (T0 after readout shall be cleared) generated by the motor speed circuit, the value (speed value* 4) displayed on the LCM display (Show subroutines/functions provided by experimental library file).

实验5\实验指导书\ZY12864D.PDF
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实验5
.....\实验指导书\单片机原理实验指导书（5）.doc

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