怎样设计一个用ADE7755和用AT89S51的单片机设计出一个电能表?_百度知 ...答:基于AT89S52单片机完成多费率单相电能表的设计,AT89S52有以下功能,8k字节Flash 闪速存储器,三级加密程序存储器,256字节内部RAM,32个可编程I/O 口线,3个 16位定时/计数器,一个 6向量两级中断结构,一个全双工串行通信口,片内振荡器及时钟电路,两种低功耗电工作方式。是一个比较适合于以开关量信号输入检测的性价比...
51单片机电子钟程序数码管显示答:sbit dula=P2^6;sbit wela=P2^7;sbit beep=P2^3;unsigned char j,k,a1,a0,b1,b0,c1,c0,s,f,m,key=10,temp,qq;uchar shi20,shi10,fen20,fen10,miao20,miao10,new,ok=1,wei;unsigned int pp;unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x...
急求:单片机上电时数码管显示“0”,编写C51语言程序 利用单片机的外部中 ...答:include<reg51.h> define uchar unsigned char;uchar distab[]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};uchar flag;sbit key=P3^2;void ext0() interrupt 0 { flag=1;} main(){ IT0=1;EA=1;EX0=1;P1=distab[0];...