1、用 1 位數碼管顯示按鍵的鍵值#include <REG51.h>#include <INTRINS.H>unsignedcharcodesz1=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e;unsignedcharcodejp=0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77;unsigned char c=0;void delay(unsigne

2、d int t)unsigned char i;while(t-)for(i=0;i<125;i+);void sm() unsigned char k,j,n,a,m=0xfe;P2=0xf0;k=P2;k=k&0xf0;if(k!=0xf0) delay(5);if(k!=0xf0)for(j=0;j<4;j+) P2=m;n=P2;for(a=0;a<16;a+) if(jpa=n)c=a;m=_crol_(m,1);void main()while(1) sm();P1=sz1c;LCD 編程流程：1 .初始化（設定 LCD 的各種工作顯示方式）2 .設定第一

3、行顯示起始地址3 .送數據到數據端口，顯示字符串4 .設定第二行顯示起始地址5 .送數據到數據端口，顯示數據1. 初始化：大概涉及到 4 個命令，發四次命令。所以把發命令編程子程序，調用子程序時只是命令代碼不一樣。void busy()rs=0;rw=1;en=1;delay(1);f=P0;en=0;busy1=f&0x80;void wc(unsigned char a) while(busy1=0x80);rs=0;rw=0;en=0;P0=a;en=1;delay(1);en=0;void chsh()wc(0x38);delay(1);wc(0x01);delay(1);wc

4、(0x0c);delay(1);wc(0x06);delay(1);Void main()chsh();2 .設定第一行顯示起始地址Void main()wc(0x80);3 .送數據到數據端口，顯示字符串送字符串到數據端口，實際上是逐個把數據送過去。所以把送數據編程子程序，調用子程序時只是數據不一樣。unsigned char hy="The number is" void wd(unsigned char b)while(busy1=0x80);rs=1;rw=0;en=0;P0=b;en=1;delay(1);en=0;Void main() for(j=0;j<

5、;13;j+)wd(hyj);4 .設定第二行顯示起始地址Void main()wc(0xc8); 5 .送數據到數據端口，顯示數據void dispd(unsigned char c)unsigned char d;d=_crol_(c,4);d=d&0x0f;if(d<0x0a)d=d+0x30;elsed=d+0x37;wd(d);c=c&0x0f;if(c<0x0a) c=c+0x30;elsec=c+0x07;wd(c);Void main()Unsigned char e=0x43;dispd(e);實驗：用 LCD 顯示鍵盤的鍵值按鍵 啟動 加 1 減

6、 1 暫停 倒計時程序void ds() interrupt 1 TH0=(65536-50000)/256;TL0=(65536-50000)%256;if(+m>19)n-;if(n=0)while(1)disp(0);F=1;delay(20);F=0;delay(20);m=0;按鍵 啟動 加 1 減 1 暫停 倒計時#include <reg51.h>sbit K1=P2A0;/ 加 1sbit K2=P2A1;/ 減 1sbit K3=P2A2;/ 暫停sbit K4=P2A3;/ 啟動sbit LED=P2A4;/ 發光二極管sbit F=P2A5;/ 蜂鳴器s

7、bit S0=P3A6;sbit S1=P3A7;void disp (unsigned char n);unsigned char m=0;unsigned char n=9;unsigned char code D=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90; void delay(unsigned int a) unsigned char b;while(-a)for(b=0;b<125;b+);void main()EA=1;ET0=1;TMOD=0x01;TH0=(65536-50000)/256;TL0=(65536-50000)%256;TR0=0;while(1)disp(n);if(K1=0)while(K1=0);disp(+n);if(K2=0)while(K2=0);disp(-n);if(K3=0)while(K3=0);TR0=0;disp(n);if(K4=0)while(K4=0);TR0=1;disp(n);void disp (unsigned char n)unsigned char i,j;i=n/10;j=n%10;P1=Di;S0=0;delay(20);P3=0xff;P1=Dj;S1=0;delay(20);P3=0xff;void ds() interrupt 1 TH