基于光电编码盘的直流伺服电机PID闭环调速系统\HC11PWM.DSN ...........................................\HC11PWM.PWI ...........................................\PWMMOTOR.ASM ...........................................\PWMMOTOR.S19 ...........................................\附录1 光电码盘的原理.doc 基于光电编码盘的直流伺服电机PID闭环调速系统