论文部分内容阅读
一、引言本文介绍的8031控制的CRT显示器可以显示中英文字符、各种图形和表格.8031完成CRT显示所需的计算与处理的同时,还可用于现场测量及工业控制,使用极为简便.该显示器可以方便地用于多种场合,作为显示部件可以清楚、直观地显示测量结果及各种操作过程,在程序控制下还可显示工业控制中被控对象故障的部位.控制线路简单、电路完善、成本低、有很高的性能价格比.二、系统工作原理本CRT控制电路示意图如图1所示.图中,74LS166为并行串行移位寄存器,该移位寄存器在MC6845地址线的控制下,将显示存储器中的字符点阵由并行输入转换成串行输出,作为图象信号送入视频
I. INTRODUCTION This article describes the 8031 control of the CRT display can display Chinese and English characters, a variety of graphics and tables. 8031 CRT display required to complete the calculation and processing, but also for field measurement and industrial control, the use of extremely simple. The display can be easily used in many occasions, as a display unit can clearly and intuitively display the measurement results and a variety of operating procedures, under the program control can also be displayed in the industrial control of the controlled object fault site. Control circuit is simple, perfect circuit , Low cost, high cost performance. Second, the system works The CRT control circuit diagram shown in Figure 1. Figure, 74LS166 parallel serial shift register, the shift register in the MC6845 address line control , It will show that the character lattice in memory will be converted into serial output by parallel input and send into video as image signal