C51读写DS12887程序 已用于开发的无线电子衡器上 包括RTC.h及RTC.c

				C51读写DS12887程序
				已用于开发的无线电子衡器上
				包括RTC.h及RTC.c
				
				/////////////////////////////////////////
				// 接口 RTC.h
				////////////////////////////////////////
				
				#include 
				//*******DS12887 *******
				
				#define YEAR_IN_RTC            0
				#define MONTH_IN_RTC           1
				#define DAY_IN_RTC             2
				#define HOUR_IN_RTC            3
				#define MINUTE_IN_RTC          4
				#define SECOND_IN_RTC          5
				#define SECOND_ALARM_IN_RTC 6
				#define MINUTE_ALARM_IN_RTC 7
				#define HOUR_ALARM_IN_RTC    8
				#define RTC_SECONDS           XBYTE[0xfe00]
				#define RTC_SECONDS_ALARM    XBYTE[0xfe01]
				#define RTC_MINUTES           XBYTE[0xfe02]
				#define RTC_MINUTES_ALARM   XBYTE[0xfe03]
				#define RTC_HOURS             XBYTE[0xfe04]
				#define RTC_HOURS_ALARM     XBYTE[0xfe05]
				#define RTC_DAYS              XBYTE[0xfe07] 
				#define RTC_MONTHS            XBYTE[0xfe08]                 
				#define RTC_YEARS             XBYTE[0xfe09]
				#define DSA                   XBYTE[0xfe0a]              //DS12887 register A
				#define DSB                   XBYTE[0xfe0b]
				#define DSC                   XBYTE[0xfe0c]
				#define DSD                   XBYTE[0xfe0d]
				
				sbit RTC_CS=P2^0;
				bit Init_RTC(void);
				bit Second_Interrupt(void);
				unsigned char Read_RTC(unsigned char);
				void Write_RTC(unsigned char,unsigned char);
				
				/////////////////////////////////////////
				// 实现部分 RTC.C
				////////////////////////////////////////
				#include 
				#include
				#include
				unsigned char Read_RTC(unsigned char option)
				{
				  
				  switch(option)
				  {
				    case YEAR_IN_RTC:return(RTC_YEARS);break;
				    case MONTH_IN_RTC:return(RTC_MONTHS);break;
				    case DAY_IN_RTC:return(RTC_DAYS);break;
				    case HOUR_IN_RTC:return(RTC_HOURS);break;
				    case MINUTE_IN_RTC:return(RTC_MINUTES);break;
				    case SECOND_IN_RTC:return(RTC_SECONDS);break;
				  }
				}
				void Write_RTC(unsigned char option,unsigned char j)
				{
				  switch(option)
				  {
				    case YEAR_IN_RTC:RTC_YEARS=j;break;
				    case MONTH_IN_RTC:RTC_MONTHS=j;break;
				    case DAY_IN_RTC:RTC_DAYS=j;break;
				    case HOUR_IN_RTC:RTC_HOURS=j;break;
				    case MINUTE_IN_RTC:RTC_MINUTES=j;break;
				    case SECOND_IN_RTC:RTC_SECONDS=j;break;
				    case SECOND_ALARM_IN_RTC:RTC_SECONDS_ALARM=j;break;
				    case MINUTE_ALARM_IN_RTC:RTC_MINUTES_ALARM=j;break;
				    case HOUR_ALARM_IN_RTC:RTC_HOURS_ALARM=j;break;
				
				  }
				}
				bit Second_Interrupt(void)
				{
				    if( (DSC&0x20)==0x20 )return(1);
				    return(0);
				}
				/*  initialize DS12887  */
				bit Init_RTC(void)
				{
				    DSA=0x20;
				    DSB=0x72;                                  //SET=0,*IE=disenable,SQW=disenable ,BCD,NO DSE
				    DSC=0x00;
				    ACC=DSD;
				    //every second interrupt
				    Write_RTC(HOUR_ALARM_IN_RTC,0xff);
				    Write_RTC(MINUTE_ALARM_IN_RTC,0xff);
				    Write_RTC(SECOND_ALARM_IN_RTC,0xff);
				    //if(ACC&0x80)return(0); //when low bat return 0
				    //return(1);
				     /* DSB=0x82;                                   //set SET=1
				  RTC_HOURS=0x23;
				  RTC_MINUTES=0x12;
				  RTC_SECONDS=0x30;
				  DSB=0x02;
				   */
				  return(1);    
				}