设计一个30秒倒计时器,每一秒显示减1,倒计时至0,LED1亮,并具有启动,停 ...答:code unsigned char tab[]= {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//共阳数码管 0-9 unsigned char Dis_Shiwei;//定义十位 unsigned char Dis_Gewei; //定义个位 void delay(unsigned int cnt){ while(--cnt);} main(){ TMOD |=0x01;//定时器设置 10ms in ...