It deals preferably with interpolation output based on divided circuit . so , it ameliorates some characteristics of stepping motor , and improves interpolation precision . in this paper program is designed by mscomm to explain work principle of communication between person computer and single microcomputer for processing files designed by cad , then it is processing component parts 本文对于在细分驱动中常出现的在细分电流的下降沿，由于电流下降速度慢而不能很好地实现细分的问题给予解决；解决了有细分电路后的插补输出控制，这样既改善了步进电机的某些性能，又提高了插补精度；为了将cad设计的加工文件直接通信给单片机，然后进行加工，本文用mscomm设计的程序用来说明其工作原理。
The results show that the exhaust fan current increases with frosting enhancement , while the increasing speed gets slower in the end of frosting , and the curves of current are slightly different at different voltages ; that the evaporation temperature decreases with frosting enhancement , and the decreasing speed becomes increasingly faster ; and that misoperation of defrosting can be avoided by using the intelligent defrosting control method based on exhaust fan current combined with evaporation temperature presented according to the experimental results 结果表明，排风机电流随结霜厚度的增加而增大，增加速率在结霜后期趋缓，不同电压下电流变化曲线略有不同；蒸发温度随结霜厚度的增加而降低，下降速度越来越快；使用根据实验结果提出的基于排风机电流和蒸发温度联合控制的智能除霜方法可以基本避免误除霜动作。
