Digital Tube Keypad Decimal count

Digital display 00~59 Button 1 each time you press the display value plus one, button 2 each press the display value minus one, button 3 function zero, button 4 start or stop timer 0

#include <reg52.h>
#define UCHAR unsigned char
#define UINT unsigned int
Sbit key1=p3^4;
Sbit key2=p3^5;
Sbit key3=p3^6;
Sbit key4=p3^7;
Sbit dula=p2^6;
Sbit wela=p2^7;
Uchar Code table[]={
0X3F,0X06,0X5B,0X4F,
0X66,0X6D,0X7D,0X07,
0X7F,0X6F,0X77,0X7C,
0x39,0x5e,0x79,0x71
};
void delayms (UINT);
Uchar Numt0,num;
void display (Uchar Numdis)
{
Uchar Shi,ge;
SHI=NUMDIS/10;
ge=numdis%10;

Dula=1;
P0=table[shi];
dula=0;
P0=0xff;
Wela=1;
P0=0xfe;
wela=0;
Delayms (5);

Dula=1;
P0=table[ge];
dula=0;
P0=0xff;
Wela=1;
P0=0XFD;
wela=0;
Delayms (5);
}


void delayms (UINT XMS)
{
UINT I,j;
for (i=xms;i>0;i--)
for (j=110;j>0;j--);
}
void Init ()
{
tmod=0x01;
th0= (65535-45872)/256;
tl0= (65536-45872)%256;
Ea=1;
Et0=1;
}


void Keyscan ()
{
if (key1==0)
{
Delayms (10);
if (key1==0)
{
num++;
if (num==60)
num=0;
while (!key1);
}
}
if (key2==0)
{
Delayms (10);
if (key2==0)
{
if (num==0)
num=60;
num--;
while (!key2);
}
}
if (key3==0)
{
Delayms (10);
if (key3==0)
{
num=0;
while (!key3);
}
}
if (key4==0)
{
Delayms (10);
if (key4==0)
{
while (!KEY4);
TR0=~TR0;
}
}
}


void Main ()
{
Init ();
while (1)
{
Keyscan ();
Display (num);
}
}
void T0_timer () Interrupt 1
{
th0= (65536-45872)/256;
Re-install initial value
tl0= (65536-45872)%256;
numt0++;
if (numt0==20)
{
numt0=0;
num++;
if (num==60)
num=0;
}
}

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Digital Tube Keypad Decimal count