HC6800单片机时钟显示与计时器C语言教程

#include<reg52.h> 
#include<absacc.h> 
#define uchar unsigned char 
#define uint unsigned int 
#define LCDCOM XBYTE[0xcffc] //LCD写命令寄存器地址 
#define LCDDATA XBYTE[0xcffd] //LCD写数据寄存器地址 
#define LCDSTATUS XBYTE[0xcffe] //LCD读状态寄存器地址 

#define DSA XBYTE[0x8f0a] //实时时钟寄存器A 
#define DSB XBYTE[0x8f0b] //实时时钟寄存器B 
#define DSC XBYTE[0x8f0c] //实时时钟寄存器C 
#define DSD XBYTE[0x8f0d] //实时时钟寄存器D 
#define SECOND XBYTE[0x8f05] //实时时钟分报警 
sbit bflag=ACC^7; 

uchar idata dt[7]={06,7,11,17,05,0,2}; //时间初值 
uchar at[7]={9,8,7,4,2,0,6}; //年，月，日，时，分，秒，星期时标寄存器地址 
uchar xdata *addr=0x8f00; //实时时钟片选地址 

//函数的声明部分 
//void delay1(uint x); 
void lcd_busy(); 
void lcd_cmd(uchar lcd_cmd); 
void lcd_data(uchar lcd_data); 
void lcd_moveto(uchar position); 
void init(void); 
//void delay( unsigned int number ); 
void init_ds(void); //实时时钟初始化 
void WDS(void); //写时标函数 
void RDS(void); //读时标函数 

uchar ymd[10]={2,0,0,0,0,0,0,0,0,0}; //年月日 
uchar hms[8]={0,0,0,0,0,0,0,0}; //时分秒 
uchar weekday[3]; 
uchar code dis_buf[12]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2e,0x3a}; 
void init_ds(void) //实时时钟初始化 
{ 
DSA=0x2f; //选时钟32.768kHz;中断周期500ms 
ACC=DSC; //清中断请求标志 
ACC=DSD; //VRT=1；数据有效 
DSB=0x7e; //中断允许，时标值为二进制码，24小时制，芯片工作,方波输出允许 
} 

void WDS(void) //写时标函数 
{ 
uchar i; 
DSB=0x8e; //置SET位为1 
DSB=0x8e; 
for(i=0;i<7;i++) 
{ 
*(addr+at[i])=dt[i]; //置时标初值 
} 
} 
void RDS(void) 
{ 
uchar i; 
do 
{ 
ACC=DSA; 
}