利用Proteus仿真软件设计一个具有按键清零功能的计时00-59的两位秒表时...答:include <reg51.H> sbit P3_5 =P3^5;unsigned char code dispcode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x00};unsigned char second;unsigned char keycnt;unsigned int tcnt;void main(void){ unsigned char i,j;TMOD=0x02...