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#include <reg51.H>
#define E2PROM_ADDR 0x12 //定义EPROM地址
sbit P3_7=P3^7; //定义计数器端口
unsigned char count =0; //定义计数器
unsigned char code table[]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
//声明e2prom的读写函数
void read_e2prom(unsigned char rom_addr, unsigned char ram_addr, unsigned char size);
void write_e2prom(unsigned char rom_addr, unsigned char ram_addr, unsigned char size);
void main(void) {
//从EPROM中读取计数保存值
read_e2prom(E2PROM_ADDR, (unsigned char)&count, 1);
P0=table[count/10]; //显示count的十位
P2=table[count%10]; //显示count的个位
while(1) {
if(P3_7==0){ //检测按键是否压下
count++; //计数器增1
if(count==100) count=0; //判断循环是否超限
P0=table[count/10]; //十位输出显示
P2=table[count%10]; //个位输出显示
//将当前计数值存入EPROM
write_e2prom(E2PROM_ADDR,(unsigned char)&count,1);
while(P3_7==0); //等待按键抬起，防止连续计数
}
}
}
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