论文部分内容阅读
采用CMOS工艺制造的MC 14500微工业控制器,是面向开关量控制的一位μP,它可以实现工业设备的多种功能程序控制,诸如脉冲输入输出、定时控制等等。一位μP只有十六条指令,指令系统简单明瞭。在配置一定硬件的条件下,使用这些指令已经可以使程序具备子程序调用,分枝转移功能,从而实现通常编程所需的条件语句结构(IF——THEN,IF——THFN——ELSE)。但是除了条件语句外,系统编程经常需要用到的还有循环语句,特别是步长型循环语句。而在许多一位机中一般并不具备执行步长型循环语句的硬件条件,这就给系统编程带来诸多不便。本文将介绍一种硬件电路,它
The MC 14500 micro-industrial controller, manufactured in CMOS process, is a μP for switch control that enables a wide range of industrial process control functions such as pulse input and output, timing control, and more. A μP has only sixteen instructions, instruction system is simple and clear. With these hardware configurations, these instructions already make it possible to have a subroutine call, a branch branch, and thus the conditional statement structure (IF - THEN, IF - THFN - ELSE) required for normal programming. However, in addition to conditional statements, system programming often need to use loop statements, especially step-type loop statements. In many one-bit machines generally do not have the hardware conditions for the implementation of step-type loop statements, which brings many inconveniences to system programming. This article will introduce a hardware circuit, it