#include
/*************************ds1302與at89s52引腳連接********************/
sbit T_RST=P3^5;
sbit T_CLK=P3^6;????????????????
sbit T_IO=P3^7;????????????????
??????????????
sbit ACC0=ACC^0;
sbit ACC7=ACC^7;
unsigned char seg[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09};???????? //0~~9段碼

/******************DS1302：寫入操作(上升沿)*********************/
void write_byte(unsigned char da)
{
?? unsigned char i;
?? ACC=da;
?? for(i=8;i>0;i--)
?? {
????? T_IO=ACC0;
?? T_CLK=0;????
????? T_CLK=1;
????? ACC=ACC>>1;
?? }
}

/******************DS1302：讀取操作（下降沿）*****************/
unsigned char read_byte(void)
{
?? unsigned char i;
?? for(i=0;i<8;i++)
?? {
????? ACC=ACC>>1;
?? T_CLK = 1;
?? T_CLK = 0;
????? ACC7 = T_IO;
?? }
?? return(ACC);

}

/******************DS1302:寫入數(shù)據(jù)（先送地址，再寫數(shù)據(jù)）***************************/
void write_1302(unsigned char addr,unsigned char da)
{
?? T_RST=0;??? //停止工作
?? T_CLK=0;????????????????????????????????
?? T_RST=1;?? //重新工作
?? write_byte(addr);??? //寫入地址
??
?? write_byte(da);
?? T_RST=0;
?? T_CLK=1;
}