本帖最后由 叶俊杰 于 2022-2-12 22:11 编辑
#include <STC12C5A60S2.H>
sbit ENLED = P1^1 ;
sbit LED = P0^1 ;
sbit A2 = P2^2;
sbit A1 = P2^1;
sbit A0 = P2^0;
unsigned char code LedChar[] = {
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
int main()
{
unsigned char cnt = 0;
unsigned char sec = 0;
ENLED = 0; //使能芯片 74HC245,注意38译码器打开数码管
A2=1;
A1=0;
A0=1;
TMOD = 0x01;
TR0 = 1; //启动定时器
TH0 = 0xB8;
TL0 = 0x00;
while(1)
{
if (TF0 == 1)
{
TF0 = 0;
TH0 = 0xB8;
TL0 = 0x00;
cnt++;
if (cnt >= 50) //达到1秒
{
cnt = 0;
P0 = LedChar[sec];
sec++; //sec--即为倒计时
if (sec >= 16)
{
sec = 0;
}
}
}
}
}
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