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#include <reg51.H>
sbit P_HC595_SER = P2^0;
sbit P_HC595_SRCLK = P2^1;
sbit P_HC595_RCLK = P2^2;
unsigned char code table[]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char code wela[]={
0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char data dis_buf[8]; //緩存數組
unsigned int Cnt_ms=0,Cnt_s=9999;
/**************** 初始化定時器0函數 ******************/
void Timer0Init(void) //1毫秒@12.000MHz
{
TMOD &= 0xF0; //設置定時器模式
TMOD |= 0x01; //設置定時器模式
TL0 = 0x18; //設置定時初始值
TH0 = 0xFC; //設置定時初始值
TF0 = 0; //清除TF0標志
TR0 = 1; //定時器0開始計時
ET0 = 1;
EA = 1;
}
/**************** 向HC595發送一個字節函數 ******************/
void Send_595(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
dat <<= 1;
P_HC595_SER = CY; //溢出位賦值數據輸出端
P_HC595_SRCLK = 1; //移位時鐘
P_HC595_SRCLK = 0;
}
}
/**************** 向HC595發送2個字節驅動碼 ******************/
void DisplayScan(void)
{
static unsigned char i;
Send_595(wela[i]);//向HC595發送位碼
Send_595(dis_buf[i]);//向HC595發送段碼
P_HC595_RCLK = 1;//鎖存輸出數據
P_HC595_RCLK = 0;
i=++i%4;
}
void main()
{
P_HC595_SRCLK = 0;//初始化移位時鐘端
P_HC595_RCLK = 0;//初始化鎖存輸出端
Timer0Init();
while(1)
{
dis_buf[0]=table[Cnt_s/1000%10];
dis_buf[1]=table[Cnt_s/100%10];
dis_buf[2]=table[Cnt_s/10%10];
dis_buf[3]=table[Cnt_s%10];
}
}
void Timer0Interrupt(void) interrupt 1
{
TL0 = 0x18; //設置定時初始值
TH0 = 0xFC; //設置定時初始值
if(++Cnt_ms>=1000)
{
Cnt_ms=0;
if(Cnt_s>0)Cnt_s--;
}
DisplayScan();
}

復制代碼

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