ds12c887死活读不出来，秒也不行

#include
#define uchar unsigned char
#define uint unsigned int

***it lcden=P3^4;
***it lcdrs=P3^5;
***it dula=P2^6;
***it wela=P2^7;
***it rd=P3^7;
***it dsds=P1^7;
***it dsrw=P1^6;
***it dsas=P1^5;
***it dscs=P1^4;

***it dsirq=P3^3;

bit flag1,flag_ri;
uchar count,s1num,flag,t0_num,x,y;
char miao,shi,fen,year,month,day,week,amiao,afen,ashi;
uchar num,flag_ds,flag_c,i,a;
uchar miao1,miao2,fen1,fen2,shi1,shi2;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};

void write_ds(uchar add,uchar date);
void set_time();

void init()
{