基于PIC单片机及阵列电路方式控制大量外设的研究

On Control on a Large Number of External Devices Based on PIC Microcontroller and Array Circuit

本文介绍了PIC单片机的特点,以及利用该芯片、移位寄存器74LS164和阵列电路控制继电器的开关闭合,来实现对大量外部设备的控制。该方法的实现可以有效地节省大量的单片机I/O引脚的使用个数,特别是在一些要实现的功能较多的工程中,效果更为显著。

This paper describes the characteristics of the PIC microcontrolle. The use of the chip, the shift reg- ister 74LS 164 and whether array circuit control relay is opened or closed is aimed to control the number of exter- nal devices. The implementation of this method can effectively reduce the number of s I / O pins. It has an obvious effects upon multi-functions proiects especially, the effect is more significant.