基于单片机的数字频率相位 计，程序采用数据统计法及不同频率分频发，使精度测量精度提到0.01 ，相位测量精度达到0.1°，虽然精度比arm、FPGA低，但在开发成本上却低很多很多-Based on single-chip digital frequency phase, the procedures for the use of data statistics and frequency of different frequency, so that the accuracy of the measurement accuracy of 0.01　mentioned, phase measurement accuracy of 0.1 °, although the accuracy than the arm, FPGA, but the development costs but much lower on many! !