文件名称:motor
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直流电机的转速控制。利用8253产生“准PWM”（占空比50 ～0 ）波形，不同的占空比影响着直流电机的转速。通过秒中断服务程序读取K7-0的数据、修改PWM的占空比，实现直流电机的转速控制。
-DC motor speed control. 8253 use a " quasi-PWM" (50 to 0 duty cycle) waveform, affecting different duty DC motor speed. Read by the interrupt service routine K7-0 seconds of data, modify the PWM duty cycle of the DC motor speed control.
-DC motor speed control. 8253 use a " quasi-PWM" (50 to 0 duty cycle) waveform, affecting different duty DC motor speed. Read by the interrupt service routine K7-0 seconds of data, modify the PWM duty cycle of the DC motor speed control.
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motor.asm