单片机PIC16F877A控制步进电机程序， 根据四相步进电动机的工作原理，通过控制输出脉冲信号的分配组合、顺序、次数、和频率实现对电动机的工作方式，旋转方向，位置和速度等控制要素进行控制。-Microcontroller PIC16F877A stepper motor control procedures, according to the four-phase stepper motor works by controlling the distribution of the combined output of the pulse signal, sequence, frequency, and frequency to achieve the motor work, direction of rotation, position and speed control elements control.