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#include <reg52.h>
#define led P2
sbit LED1 = P3^0;
sbit LED2 = P3^1;
sbit LED3 = P3^2;
sbit LED4 = P3^3;
sbit LED5 = P3^4;
sbit LED6 = P3^5;
unsigned char code LedChar[] = { 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E};//數碼管顯示字符轉換表
unsigned char LedBuff[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};//數碼管顯示緩沖區，初值 0xFF 確保啟動時都不亮
unsigned char i = 0; //動態掃描的索引
unsigned int cnt = 0; //記錄 T0 中斷次數
unsigned char flag1s = 0; //1 秒定時標志
void main()
{
unsigned long sec ; //記錄經過的秒數
EA = 1; //使能總中斷
TMOD = 0x01; //設置 T0 為模式 1
TH0 = 0xFC; //為 T0 賦初值 0xFC67，定時 1ms
TL0 = 0x67;
ET0 = 1; //使能 T0 中斷
TR0 = 1; //啟動 T0
while (1)
{
if (flag1s == 1) //判斷 1 秒定時標志
{
flag1s = 0; //1 秒定時標志清零
sec++; //秒計數自加 1
//以下代碼將 sec 按十進制位從低到高依次提取并轉為數碼管顯示字符
}
LedBuff[0] = LedChar[sec%10];
LedBuff[1] = LedChar[sec/10%10];
LedBuff[2] = LedChar[sec/100%10];
LedBuff[3] = LedChar[sec/1000%10];
LedBuff[4] = LedChar[sec/10000%10];
LedBuff[5] = LedChar[sec/100000%10];
}
}
/* 定時器 0 中斷服務函數 */
void InterruptTimer0() interrupt 1
{
TH0 = 0xFC; //重新加載初值
TL0 = 0x67;
cnt++; //中斷次數計數值加 1
if (cnt >= 1000) //中斷 1000 次即 1 秒
{
cnt = 0; //清零計數值以重新開始下 1 秒計時
flag1s = 1; //設置 1 秒定時標志為 1
}
//以下代碼完成數碼管動態掃描刷新
P2 = 0xff; //顯示消隱
switch (i)
{
case 0: LED1 = 0;i++; led = LedBuff[0]; LED1 = 1; break;
case 1: LED2 = 0;i++; led = LedBuff[1]; LED2 = 1; break;
case 2: LED3 = 0;i++; led = LedBuff[2]; LED3 = 1; break;
case 3: LED4 = 0;i++; led = LedBuff[3]; LED4 = 1; break;
case 4: LED5 = 0;i++; led = LedBuff[4]; LED5 = 1; break;
case 5: LED6 = 0;i=0; led = LedBuff[5]; LED6 = 1; break;
default: break;
}
}

復制代碼

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