求大神说一下这个代码是干啥的？

#include <AT89X52.H>
unsigned char code dispbitcode[]={0xfe,0xfd,0xfb,0xf7, 0xef,0xdf,0xbf,0x7f};
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66, 0x6d,0x7d,0x07,0x7f,0x6f,0x00};
unsigned char dispbuf[8]={10,10,10,10,10,0,0,0};
unsigned char dispcount;
unsigned char getdata;
unsigned int temp;
long int i;
unsigned int R1;
sbit ST=P3^0;
sbit OE=P3^1;
sbit EOC=P3^2;
sbit CLK=P3^3;
void main(void)
{
ST=0;
OE=0;
ET0=1;
ET1=1;
EA=1;
TMOD=0x12;
TH0=216;
TL0=216;
TH1=(65536-5000)/256;
TL1=(65536-5000)%256;
TR1=1;
TR0=1;
ST=1;
ST=0;
while(1)
{
if(EOC==1)
{
OE=1;
getdata=P0;
OE=0;
i=getdata*196;
dispbuf[5]=i/10000;
i=i%10000;
dispbuf[6]=i/1000;
i=i%1000;
dispbuf[7]=i/100;
ST=1;
ST=0;
}
}
}
void t0(void) interrupt 1 using 0 //¶¨Ê±Æ÷0 ÖжϷþÎñ
{
CLK=~CLK;
}
void t1(void) interrupt 3 using 0 //¶¨Ê±Æ÷1 ÖжϷþÎñ
{
TH1=(65536-6000)/256;
TL1=(65536-6000)%256;
P2=0xff;
P1=dispcode[dispbuf[dispcount]];
P2=dispbitcode[dispcount];
if(dispcount==5)
{
P1=P1 | 0x80;
}
dispcount++;
if(dispcount==8)
{
dispcount=0;
}
}