Design and simulation of the low frequency signal generator based on MCU

A sine signal generator based on AT89C51 is developed for improving the expensive price and not easy to automatic regulation when output the low-frequency of traditional signal generator.The method of programming and software look-up table is been used to read the signal which has been processed with dispersing processing.And the signal will be restored by D/A.In order to obtained Sawtooth-wave,square-wave,sine signals,and the simulation by the computer software Proteus is been done.Their frequency,amplitude and phase and different waveforms can be changed freely.And those results consistent with the theory.