IIC.rar_24c04_单片机IIC仿真

#include<reg52.h> #define uchar unsigned char sbit sda=P2^0; sbit scl=P2^1; sbit wei=P2^7; sbit duan=P2^6; uchar code table[]= {0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c, 0x39,0x5e,0x79,0x71,0x00}; uchar m,a,num,timer,x; void delay()//延时5um左右 { ; ; } void start() //启动 { sda=1; delay(); scl=1; delay(); sda=0; delay(); } void stop() //停止 { sda=0; delay(); scl=1; delay(); sda=1; delay(); } void respons() //应答 { uchar i; scl=1; while((sda==1)&&(i<250)) { i++; } scl=0; delay(); } void init() { sda=1; delay(); scl=1; delay(); } void write_byte(uchar da) { uchar i,temp; temp=da; for(i=0;i<8;i++) { temp=temp<<1; scl=0; delay(); sda=CY; delay(); scl=1; delay(); } scl=0; delay(); sda=1; delay(); } uchar read_byte() { uchar i,j,k; scl=0; delay(); sda=1; delay(); for(i=0;i<8;i++) { scl=1; delay(); j=sda; k=(k<<1)|j; scl=0; delay(); } return k; } void write_add(uchar address,uchar date) { start(); write_byte(0xa0); respons(); write_byte(address); respons(); write_byte(date); respons(); stop(); } uchar read_add(uchar address) { uchar ae; start(); write_byte(0xa0); respons(); write_byte(address); respons(); start(); write_byte(0xa1); respons(); ae=read_byte(); stop(); return ae; } void display(uchar distimer) { uchar shi,ge; shi=distimer/10; ge=distimer%10; wei=1; P0=0xfd; wei=0; duan=1; P0=table[shi]; duan=0; delay(); wei=1; P0=0xfe; wei=0; duan=1; P0=table[ge]; duan=0; delay(); } void main() { EA=1; ET0=1; TMOD=0x01; TH0=(65536-50000)/256; TL0=(65536-50000)%256; TR0=1; num=0; while(1) { init(); x=read_add(3); timer=x; display(timer); write_add(3,timer); for(m=0;m<=100;m++) { delay(); } } } void inner0() interrupt 1 { if(num<=20) { num++; } else { num=0; timer++; } }