/*Timer 1, timing mode working mode 1 16-bit counter,
enable buzzer after timing 5 minutes*/
#include <reg52.h> //51 header file
#define uchar unsigned char//Macro definition
#define uint unsigned int//Macro definition
sbit wei = P2^7;//Bit definition digital tube bit selection latch interface
sbit duan = P2^6;//Bit definition digital tube segment selection latch interface
sbit beep = P2^3; //Buzzer interface
//数码管段选表
uchar code leddata[]={
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x6F, //"9"
0x77, //"A"
0x7C, //"B"
0x39, //"C"
0x5E, //"D"
0x79, //"E"
0x71, //"F"
0x76, //"H"
0x38, //"L"
0x37, //"n"
0x3E, //"u"
0x73, //"P"
0x5C, //"o"
0x40, //"-"
0x00, //off
0x00 //custom
};
//Millisecond delay function
void delay(uint z) //software delay 1ms
{
uint x,y;
for(x = z; x > 0; x--)
for(y = 114; y > 0 ; y --);
}
//Dynamic display function of two-digit digital tube
void display(uchar i)
{
uchar bai,shi, ge;
bai = i / 100; //The integer part of modulo i divided by 100
shi = i / 10 % 10;// Divide modulo i by 10 and then modulo 10 to take the remainder
ge = i % 10;//to find the remainder i divide by 10 and take the remainder
P0 = 0xff; //Clear the broken code
wei = 1;//Turn on the bit selection
P0 = 0xfe;//1111 1110 only select the first digital tube
wei = 0; //Turn off the bit selection
duan = 1; //Open segment selection
P0 = leddata[bai];
duan = 0; //Close segment selection
delay(5);//Delay 5ms
P0 = 0xff;//Clear broken code
wei = 1; / /Open the bit selection
P0 = 0xfd;//1111 1101 only strobe the second digital tube
wei = 0; //Close the bit selection
duan = 1;//Open the segment selection
P0 = leddata[shi];
duan = 0; / /Close segment selection
delay(5);//Delay 5 milliseconds
P0 = 0xff;//Clear the broken code
wei = 1; //Open the bit selection
P0 = 0xfb;//1111 1011 only select the third digital tube
wei = 0; //Close the bit selection
duan = 1;//Open Segment selection
P0 = leddata[ge];
duan = 0; //close segment selection
delay(5);//delay 5 milliseconds
}
void main()
{
uchar a;//50 times count
uint b;//Second count
TR1 = 1;//Start T1
TMOD = 0x10;//T1 is a timer, working mode 1 16-bit counter
TH1 = 0x4b;
TL1 = 0xfc;//0x4bfc timing 50ms
while(1)
{
if(TF1 == 1)//Determine whether T1 overflows
{
TH1 = 0x4b;
TL1 = 0xfc;//0x4bfc timing 50ms
TF1 = 0;//Clear to facilitate the next Time judgment
a++;//50ms count plus 1
}
if(a == 20)//Judgment whether it is 1 second
{
a = 0;//Clear to record the number of 50ms next time
b++;//Second plus 1
}
display(b);//Display the value of seconds
if(b == 360)//Check if it is 5 minutes
{
TR1 = 0;//Time to close timer 1
beep = 0; //Enable buzzer
delay(4000);//Enable time 4 seconds
beep = 1;//Turn off the buzzer
while(1); //Stop the program
}
}
}