i m making project for digital clk with digi calendar,can any1 please tell me the difference btwn AT89C51 and 52?????????

[Rahul]

please tell me also whether the code is correct or not….…much needed…pls heLp

 

 

PROGRAM

#include <stdio.h>

#include<reg51.h>

#include <absacc.h>

#define COL P3

#define ROW P1

sbit rs=P1^5;

sbit rw=P1^6;

sbit en=P1^7;

#define ldata P2

void lcdinit();

void rtcinit();

void lcddata(unsigned char);

void lcdcmd(unsigned char);

void lcddelay(int);

void lcdoption();

void lcdhr();

void lcdmin();

void lcdmonth();

void lcdday();

char KEYPD();

void bcdconv(unsigned char);

unsigned char keypad[4][4]={‘0’, ‘1’, ‘2’, ‘3’,4′, ‘5’, ‘6’, ‘7’, ‘8’,

‘9’, ‘A’, ‘B’,’C’, ‘D’, ‘E’, ‘F’};

void rtcinit(void)

{ lcddelay(250);

XBYTE[10]=0x20;

XBYTE[11]=0x83;

XBYTE[0]=0x30; //sec

XBYTE[2]=0x30; //min

XBYTE[4]=0x13; //hour

XBYTE[7]=0x27;

XBYTE[8]=0x02;

XBYTE[9]=0x08;

XBYTE[11]=0x03;

}

 

void bcdconv(unsigned char mybyte)

{

unsigned char x,y;

x=mybyte & 0x0F;

x=x|0x30;

y=mybyte&0xF0;

y=y>>4;

y=y|0x30;

lcddata(y);

lcddata(x);

}

void lcddelay(int k)

{ int i,j;

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

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

}

void lcdcmd(unsigned char value)

{ ldata=value;

rs=0;

rw=0;

en=1;

lcdelay(1);

en=0;

return;

}

void lcddata(unsigned char value)

{ ldata=value;

rs=1;

rw=0;

en=1;

lcddelay(1);

en=0;

return;

}

void lcdinit()

{ lcdcmd(0x38);

lcdcmd(0x0E);

lcdcmd(0x01);

lcdcmd(0x06);

lcdcmd(0x80);

}

void lcdoption()

{ lcddata(‘1’);

lcddata(‘:’);

lcddata(‘2’);

lcddata(‘:’);

lcddata(‘3’);

lcddata(‘ ‘);

lcddata(‘:’);

}

void lcdhr()

{ lcddata(‘E’);

lcddata(‘N’);

lcddata(‘T’);

lcddata(‘ ‘);

lcddata(‘H’);

lcddata(‘R’);

lcddata(‘:’);

}

void lcdmin()

{ lcddata(‘ ‘);

lcddata(‘E’);

lcddata(‘N’);

lcddata(‘T’);

lcddata(‘ ‘);

lcddata(‘M’);

lcddata(‘I’);

lcddata(‘N’);

lcddata(‘:’);

}

void lcdmonth()

{ lcddata(‘E’);

lcddata(‘N’);

lcddata(‘T’);

lcddata(‘ ‘);

lcddata(‘m’);

lcddata(‘o’);

lcddata(‘n’);

lcddata(‘:’);

}

void lcdday()

{ lcddata(‘E’);

lcddata(‘N’);

lcddata(‘T’);

lcddata(‘ ‘);

lcddata(‘d’);

lcddata(‘a’);

lcddata(‘y’);

lcddata(‘:’);

}

char KEYPD()

{

char colloc, rowloc;

COL=0xFF;

while(1)

{

do

{

ROW=0x00;

colloc=COL;

colloc&=0x0F;

}

while(colloc!=0x0F);

do

{

do

{ lcddelay(1);

colloc=COL;

colloc &= 0x0F;

}

while(colloc==0x0F);

lcddelay(1);

colloc=COL;

colloc&=0x0F;

}

while(colloc==0x0F);

while(1)

{

ROW=0xFE;

colloc=COL;

colloc&=0x0F;

if (colloc != 0x0F)

{

rowloc=0;

break;

}

ROW=0xFD;

colloc=COL;

colloc&=0x0F;

if (colloc != 0x0F)

{

rowloc=1;

break;

}

ROW=0xFB;

colloc=COL;

colloc&=0x0F;

if (colloc != 0x0F)

{

rowloc=2;

break;

}

ROW=0xF7;

colloc=COL;

colloc&=0x0F;

if (colloc != 0x0F)

{

rowloc=3;

break;

}

}

if (colloc== 0x0E)

return(keypad[rowloc][0]);

else if(colloc==0x0D)

return(keypad [rowloc][1]);

else if(colloc==0x0B)

return(keypad [rowloc][2]);

else

return(keypad [rowloc][3]);

}

}

void userintface(void) interrupt 0

{ char ch, ch_hr[2], ch_min[2], HOUR, MINUTE,MONTH,DAY;

IE=0x80;

lcdcmd(0x01);

lcdoption();

ch=KEYPD();

lcddata(ch);

lcddelay(200);

if(ch== ‘1’)

{ lcdcmd(0x01);

lcdhr();

lcddelay(25);

ch_hr[1]=KEYPD();

lcdcmd(0x01);

lcdcmd(0x80);

lcddata(ch_hr[1]);

ch_hr[0]=KEYPD();

lcddata(ch_hr[0]);

lcddelay(15);

lcdcmd(0x01);

lcdcmd(0x80);

lcdmin();

lcddelay(25);

lcdcmd(0x01);

lcdcmd(0x80);

ch_min[1]=KEYPD();

lcddata(ch_min[1]);

ch_min[0]=KEYPD();

lcddata(ch_min[0]);

lcddelay(15);

HOUR= ch_hr[0] & 0x0F;

ch_hr[1]=ch_hr[1] & 0x0F;

ch_hr[1]= ch_hr[1]<<4;

HOUR=HOUR | ch_hr[1];

MINUTE= ch_min[0] & 0x0F;

ch_min[1]=ch_min[1] & 0x0F;

ch_min[1]=ch_min[1]<<4;

MINUTE=MINUTE | ch_min[1];

}

if(ch==’2’)

{ lcdcmd(0x01);

lcdmonth();

lcddelay(25);

ch_hr[1]=KEYPD();

lcdcmd(0x01);

lcdcmd(0x80);

lcddata(ch_hr[1]);

ch_hr[0]=KEYPD();

lcddata(ch_hr[0]);

lcddelay(15);

lcdcmd(0x01);

lcdcmd(0x80);

lcdday();

lcddelay(25);

lcdcmd(0x01);

lcdcmd(0x80);

ch_min[1]=KEYPD();

lcddata(ch_min[1]);

ch_min[0]=KEYPD();

lcddata(ch_min[0]);

lcddelay(15);

MONTH= ch_hr[0] & 0x0F;

ch_hr[1]=ch_hr[1] & 0x0F;

ch_hr[1]= ch_hr[1]<<4;

MONTH=MONTH | ch_hr[1];

DAY= ch_min[0] & 0x0F;

ch_min[1]=ch_min[1] & 0x0F;

ch_min[1]=ch_min[1]<<4;

DAY=DAY | ch_min[1];

}

switch(ch)

{ case ‘

1′: XBYTE[4]=HOUR; //min

XBYTE[2]=MINUTE;

case ‘2’:XBYTE [8]=MONTH;

XBYTE[7]=DAY;

}}

main()

{

unsigned char HR, MIN, SEC,day,month,year;

IE=0x81;

lcdinit();

rtcinit();

while(1)

{

HR=XBYTE[4];

bcdconv(HR);

lcddata(‘:’);

MIN=XBYTE[2];

bcdconv(MIN);

lcddata(‘:’);

SEC=XBYTE[0];

bcdconv(SEC);

lcdcmd(0xc2);

day=XBYTE[7];

bcdconv(day);

lcddata(‘/’);

month=XBYTE[8];

bcdconv(month);

lcddata(‘/’);

year=XBYTE[9];

bcdconv(year);

lcddelay(45);

lcdcmd(0x01);

lcdcmd(0x82);

IE=0x81;

}

}

 

  

[neha sharma]

first post your circuit diagram …

[Author]

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