PIC16F877A basic tutorial

PIC16F877A

PIN DIAGRAMS

I/O PORTS                DIRECTION CONTROL REG.    NO OF PINS

PORTA                                  TRISA                                                6

PORTB                                  TRISB                                                8

PORTC                                  TRISC                                                8

PORTD                                  TRISD                                                8

PORTE                                  TRISE                                                3

EXAMPLE:

                        TRISB=0XFF     MAKE PORTB AS INPUT PORT

                        TRISB=0X00      MAKE PORTB AS OUTPUT PORT

BASIC PROGRAM TO ON/OFF LED’S

#include<pic.h>

void delay()

{

int i;

for(i=0;i<10000;i++);

}

void main()

{

TRISA=0X00;                       // MAKE PORTA AS OUTPUT//

while(1)

{

PORTA=0XFF;                    //LED’S - ON//

delay();

PORTA=0X00;                     //LED’S-OFF//

delay();

}

}

UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER (USART)

SPBRG=X

BAUD RATE =F_OSC / (16(X+1))

BASIC PGM FOR TRANSMISSION

# include<pic.h>

#define _XTAL_FREQ 4000000

__CONFIG(WDTDIS & XT & UNPROTECT);

void main()

{

TXSTA=0X24;

RCSTA=0X90;

SPBRG=0X19;

TRISC=0X80;

while(1)

{

TXREG='k';

while(TXIF==0);

TXIF=0;

}

}

LCD INTERFACING PROGRAM

#include<pic.h>

#define _XTAL_FREQ 4000000

__CONFIG(WDTDIS & XT & UNPROTECT);

void delay()

{

int i;

for(i=0;i<10;i++);

}

void COMMAND(char t)

{

PORTD=t;

RC0=0;

RC1=0;

RC2=1;

delay();

RC2=0;

}

void data(char t)

{

PORTD=t;

RC0=1;

RC1=0;

RC2=1;

delay();

RC2=0;

}

void main()

{

TRISC=0X00;

TRISD=0X00;

COMMAND(0X06);

COMMAND(0X0E);

COMMAND(0X01);

COMMAND(0X80);

COMMAND(0X38);

while(1)

{

data('w');

delay();

}

}