求程序...用AT89C51单片机的定时/计数器T0产生一秒的定时时间,作为秒计...答:include <reg51.H> sbit P3_5 =P3^5;void delay(){ unsigned char i,j;for(j=20;j>0;j--)for( i= 250;i>0;i--);} unsigned char code dispcode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x00};unsigned char second...