at89c51 Digital Voltmeter

1，消除按键的抖动问题 因为按键在闭合或断开过程中出现一段抖动期，主要由于按键的不稳定性引起的，这时会呈现一串页脉冲，时间的长短和开关的机械特性有关。一般在5ms~10ms之间。为保证CPU对键的一次闭合作一次处理，必须去抖动。在键的稳定闭合或断开时读键的状态。 2，据EICE51原理图编写并调试一个键输入子程序，其功能为判断键盘上有无键输入，若有键入，作去抖动处理后，计算输入键的键号送累加器A。-eliminate jitter button issues as keys or disconnect the closure process for some jitter period, mainly due to the instability of the keys to the cause, then it will result in a bunch of pages pulse, the duration and switches on the mechanical properties. General ~ 10ms between 5ms. To ensure that the CPU in a pair of keys a close cooperation, must go jitter. The key to the stability closed or disconnected when reading the key state. 2, EICE51 schematics prepared and debug a key input subroutine, and its function of determining whether keys on the keyboard input, if typing for to handle jitter, the admission of Bond, Bond sent accumulator A.

给出具体的几个汇编源代码.相信您看过之后对汇编语言编程会有所了解.-give a specific compilation of several source code. Do you believe that, after reading the assembly language programming will understand.

这是通过制作一个简单的程序开始代码视觉的一课。

本程序是数字钟的单片机汇编程序，可供大家参考。-This procedure is the single-chip digital clock assembler for your reference.

地磁炉控制程序 （带三位8字数码管显示，MCU用HOLTEK 46R47，18PIN，8M晶振，取消所有I/O口的内部上拉电阻）-geomagnetic furnace control procedures (with three eight characters Digital Display, MCU with HOLTEK 46R47. 18PIN, 8M Oscillator, the abolition of all I/O I draw the internal resistance)

汇编语言写的，显示彩色矩形块。比较简单，给初学图形者用的-Written in assembly language, showing rectangular blocks of color. Relatively simple graphics are used to beginners

随机生成一个有外墙的迷宫，找出迷宫通路并在迷宫图中显示出，给出具体路径-Randomly generated with the external walls of a maze of pathways in the maze of the maze to find the figure shows that given a specific path

题目：利用条件运算符的嵌套来完成此题：学习成绩>=90分的同学用A表示，60-89分之间的用B表示，60分以下的用C表示。 1.程序分析：(a>b)?a:b这是条件运算符的基本例子。-Title: the use of nested conditional operator to complete this question: academic> = 90 points with A classmate said that 60-89 between the use of B said that the 60 points or less with C said. 1. Program analysis: (a> b)? A: b This is a conditional operator s basic example.

实现单片机模拟iic，从而使单片机控制iic芯片 -Realize single-chip analog iic, thereby enabling single-chip microcomputer control chip IIC

用汇编语言设计键盘打字程序，通过微机中的8255/8253/8259芯片的控制来实现-Assembly language using the keyboard typing the design process, through 8255/8253/8259 chip microcomputer in the control to achieve