P89v51rd2 Interfacing with DS12C887 RTC

[raju m]

My timer is not updating when I interface with P89v51rd2 . When I used same code with 89s52 i got output. Whats the pronlem.

Please Help Me

 

Code

 

 

//Program for Digital clock using RTC DS12C887 and 8051 microcontroller (AT89C51) with time set

/*24 hr clock

set p3^3=0,then start=0 then set time by dig_hr1 & dig_min1, then remove p3^3 & start	*/

#include<reg51.h>

#include<absacc.h>

#define dataport P2

#define port P1

#define lcdport P3

sbit reset = port^0;

sbit rs =port^1;

sbit rw =port^2;

sbit e = port^3;

sbit dig_hr1=port^4;

sbit dig_min1=port^5;

sbit start=port^6;

int  min1=0,hr1=0;

int min0=60,hr0=25;

unsigned char temp=60,hr,min,sec,num[60]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0X09,0X10,0X11,0X12,0X13,0X14,0X15,0X16,0X17,0X18,0X19,0X20,0X21,0X22,0X23,0X24,0X25,0X26,0X27,0X28,0X29,0X30,0X31,0X32,0X33,0X34,0X35,0X36,0X37,0X38,0X39,0X40,0X41,0X42,0X43,0X44,0X45,0X46,0X47,0X48,0X49,0X50,0X51,0X52,0X53,0X54,0X55,0X56,0X57,0X58,0X59};



void delay(unsigned int msec )

{

int i ,j ;

for(i=0;i<msec;i++)

for(j=0; j<1275; j++);

}



void lcd_cmd(unsigned char item)

{

dataport = item;

rs= 0;

rw=0;

e=1;

delay(1);

e=0;

return;

}



// function to send data

void lcd_data(unsigned char item)

{

dataport = item;

rs= 1;

rw=0;

e=1;

delay(1);

e=0;

return;

}



void lcd_data_string(unsigned char *str)

{

int i=0;

while(str!='')

{

lcd_data(str);

i++;

delay(1);

}

return;

}



lcd_data_int(int time_val)

{

int int_amt;

int_amt=time_val/10;

lcd_data(int_amt+48);

int_amt=time_val%10;

lcd_data(int_amt+48);

}





void lcd()

{

lcd_cmd(0x38);

delay(5);

lcd_cmd(0x0C);

delay(5);

lcd_cmd(0x80);

delay(5);

}



void set_rtc_time()

{

XBYTE[10]=0x20;

XBYTE[11]=0x82;

XBYTE[0]=0x00;

XBYTE[2]=min;

XBYTE[4]=hr;

XBYTE[7]=0x01;

XBYTE[8]=0x01;

XBYTE[9]=0x10;

XBYTE[1]=0xFF;

XBYTE[3]=0xFF;

XBYTE[5]=0xFF;

XBYTE[11]=0x22;

}



void set_hr1()

{

hr1++;

if(hr1>23)

hr1=0;

lcd_cmd(0xc3);

lcd_data_int(hr1);

lcd_data(':');

hr0=hr1;

}



void set_min1()

{

min1++;

if(min1>59)

min1=0;

lcd_cmd(0xc6);

lcd_data_int(min1);

min0=min1;

}



void set_time()	interrupt 2

{

lcd_cmd(0x01);

if(start==0)

{

lcd_data_string("SET TIMING");

lcd_cmd(0xc3);

lcd_data_int(hr1);

lcd_data(':');

lcd_data_int(min1);

while(start==0)

{

delay(10);

if(dig_hr1==0)

set_hr1();

if(dig_min1==0)

set_min1();

}

}

lcd_cmd(0x01);

hr=num[hr1];

min=num[min1];

set_rtc_time();

lcd_cmd(0x80);

lcd_data_string("TIME:");

hr0=25;

min0=60;

}



bcdconv(unsigned char mybyte)

{

unsigned char x,y;

x=	mybyte & 0x0F;

x=x | 0x30;

y= mybyte & 0xF0;

y=y>>4;

y=y | 0x30;

lcd_data(y);

lcd_data(x);

}



void read_rtc_display()

{

reset=0;

reset=1;

XBYTE[11]=0x02;

hr=XBYTE[4];

lcd_cmd(0x87);

min=XBYTE[2];

sec=XBYTE[0];

if(hr!=hr0)

{

lcd_cmd(0X87);

bcdconv(hr);

lcd_data(':');

hr0=hr;

}

if(min!=min0)

{

lcd_cmd(0X8A);

bcdconv(min);

lcd_data(':');

min0=min;

}

if(sec!=temp)

{

lcd_cmd(0x8D);

bcdconv(sec);

temp=sec;

}

}



void main()

{

reset=1;

lcd();

XBYTE[10]=0x20;

XBYTE[1]=0xFF;

XBYTE[3]=0xFF;

XBYTE[5]=0xFF;

XBYTE[11]=0x02;

lcd_cmd(0x01);

IE=0x84;

lcd_cmd(0x80);

lcd_data_string("TIME:");

while(1)

{

read_rtc_display();

}

}

 

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