12887.c

一个充电控制器的完整单片机程序

//#define unsigned char unsigned char
//#define uint unsigned int
#include <absacc.h>
#include <AT89X52.H>

#define P128870 XBYTE[0x2000] //second
#define P128871 XBYTE[0x2001] //second alarm
#define P128872 XBYTE[0x2002] //minutes
#define P128873 XBYTE[0x2003] //minutes alarm
#define P128874 XBYTE[0x2004] //hours
#define P128875 XBYTE[0x2005] //hours alarm
#define P128876 XBYTE[0x2006] //Day of the week
#define P128877 XBYTE[0x2007] //Day of the month
#define P128878 XBYTE[0x2008] //month
#define P128879 XBYTE[0x2009] //year
#define P12887a XBYTE[0x200A] //A register
#define P12887b XBYTE[0x200B] //B register
#define P12887c XBYTE[0x200C] //C register
#define P12887d XBYTE[0x200D] //D register

static unsigned char xdata time_area[0x1E] _at_ 0x2000;

void setup12887(unsigned char *p)  //set system timer
//24hours per day, binary system, P12887b=0x26,AIP
//24hours per day, BCD system, P12887b=0x22;
{
  unsigned char data i;
    P12887b=0xa6;
    P12887a=0x70;
    P128870=*p++;
    P128871=0xff;
    P128872=*p++;
    P128873=0xff;
    P128874=*p++;
    P128875=0xff; 
    P128876=*p++;
    P128877=*p++;
    P128878=*p++;  
    P128879=*p++; 
    P12887a=0x20;
    i=P12887c;
    i=P12887d;
    P12887b=0x26;//start clock  
}
//

void read12887(unsigned char *p)   //read system timer
{
  unsigned char data i,t;
	i=ACC;
	//UIP==0 per second, update after 244us
   do{ ACC=P12887a;}while(BUSYFLAG);
    *p++=P128879;
    *p++=P128878;
    *p++=P128877;
    *p++=P128874;
    *p++=P128872;
    *p++=P128870;
    *p++=P128876;//day of the week
  t=P12887c;	  
	ACC=i;
}

void start12887(void)      //start clock
{
  unsigned char data i;
    P12887b=0xa6;
    P12887a=0x70; 
    P128871=0xff;
    P128873=0xff;
    P128875=0xff;
    P12887a=0x20;
    P12887b=0x26;
    i=P12887c;
    i=P12887d;
}