单片机终极版.docxVIP

1、LED 闪烁程序 注释#includereg52.h sbit LED = P0^0; sbit ADDR0 = P1^0; sbit ADDR1 = P1^1; sbit ADDR2 = P1^2; sbit ADDR3 = P1^3; sbit ENLED = P1^4; void main() //void即函数类型 { //以下为声明语句部分 unsigned int i = 0; //定义一个无符号整型变量i，并赋初值0 //以下为执行语句部分 ENLED = 0; //U3、U4两片74HC138总使能 ADDR3 = 1; //使能U3使之正常输出 ADDR2 = 1; //经U3的Y6输出开启三极管Q16 ADDR1 = 1; ADDR0 = 0; while (1) { LED = 0; //点亮小灯 for (i=0; i30000; i++); //延时一段时间 LED = 1; //熄灭小灯 for (i=0; i30000; i++); //延时一段时间 } } 2、流水灯的程序 注释#include reg52.h sbit ADDR0 = P1^0; sbit ADDR1 = P1^1; sbit ADDR2 = P1^2; sbit ADDR3 = P1^3; sbit ENLED = P1^4; void main() { unsigned int i = 0; //定义循环变量i，用于软件延时 unsigned char cnt = 0; //定义计数变量cnt，用于移位控制 ENLED = 0; ADDR3 = 1; ADDR2 = 1; ADDR1 = 1; ADDR0 = 0; while (1) //主循环，程序无限循环执行该循环体语句 { P0 = ~(0x01 cnt); //P0等于1左移cnt位，控制8个LED for (i=0; i20000; i++); //软件延时 cnt++; //移位计数变量自加1 if (cnt = 8) //移位计数超过7后，再重新从0开始 { cnt = 0; } } } 3、数码管的静态显示程序 注释#include reg52.h sbit ADDR0 = P1^0; sbit ADDR1 = P1^1; sbit ADDR2 = P1^2; sbit ADDR3 = P1^3; sbit ENLED = P1^4; //用数组来存储数码管的真值表，数组将在下一章详细介绍 unsigned char code LedChar[] = { 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E }; void main() { unsigned char cnt = 0; //记录T0中断次数 unsigned char sec = 0; //记录经过的秒数 ENLED = 0; //使能U3，选择数码管DS1 ADDR3 = 1; ADDR2 = 0; ADDR1 = 0; ADDR0 = 0; TMOD = 0x01; //设置T0为模式1 TH0 = 0xB8; //为T0赋初值0xB800 TL0 = 0x00; TR0 = 1; //启动T0 while (1) { if (TF0 == 1) //判断T0是否溢出 { TF0 = 0; //T0溢出后，清零中断标志 TH0 = 0xB8; //并重新赋初值 TL0 = 0x00; cnt++; //计数值自加1 if (cnt = 50) //判断T0溢出是否达到50次 { cnt = 0; //达到50次后计数值清零 P0 = LedChar[sec]; //当前秒数对应的真值表中的值送到P0口 sec++; //秒数记录自加1 if (sec = 16)