雖然PIC都是8位的單片機，但都采用RISC（Reduced Instruction Set Computing）核心結構，這有別于過去一般的CISC(Complex Instruction Set Computing)結構。所謂RISC結構就是采用哈佛雙總線結構，將地址總線與數據總線分開，因此在同一個指令執(zhí)行過程中，數據與地址可以同時傳送，避免了總線處理上的瓶頸。
基于PIC單片機的脈沖電源:設計了一種金屬凝固過程用脈沖電源。該電源采用pic16f877作為主控芯片，實現對窄脈沖電流幅值的檢測，以及時電流脈沖幅值根據模糊PID算法進行閑環(huán)控制。使用結果表明：該電源的輸出脈沖波形良好，電流幅值穩(wěn)定，滿足合金材料凝固過程的工藝要求且運行穩(wěn)定可靠。關鍵詞：脈沖電源；pic16f877單片機；模糊PID；閑環(huán)控制
Abstract：A kind of pulse power supply was designed which uses in the metal solidification process ．．I11is power supply used pic16f877 to take the master control chip reali on to the narrow pulse electric current peak-to-peak value examination，carried on the closed-loop control to the electric current pulse peak-to-peak value basis fuzzy PID algorithm．The use result indicated ，this power supply output se profile is good，and the electric current peak-to-p~k value is stable，It satisfies the alloy material solidification process the technological requirement and movement stable reliable，Key words：p se po wer supply；pic16f877single-chip microcontroller；f r PID；closed-loop control
