Sample code for PIC16F628

/////////////////////////////////////////////////////////////

// This test code works with the PIC-PG4-628 demo board

// from Olimex (http://www.olimex.com/dev/index.html)

/////////////////////////////////////////////////////////////



//20 MHz quartz

#pragma CLOCK_FREQ 20000000

//RS232 settings

#pragma RS232_RXPIN 2

#pragma RS232_TXPIN 3



//Register mapped variables

char _porta@0x05;	//PortA

char _trisa@0x85;	//TrisA

char _portb@0x06;	//PortB

char _trisb@0x86;	//TrisB

char _cmcon@0x1F;	//CMCON



//Configuration Bits

asm

{

list p=16F628

__config H'3F8A'

}//WDT,PWRT,MCLR,BODEN off, LVP on, HS, CP Off



//Main entry point

main()

{

    //Hardware Initialization

    _cmcon = 7;

    _trisa = 4;

    _trisb = 0;

    _porta = 0;

    _portb = 0;



    //Output test string into serial port

    putchar( 'T' );

    putchar( 'e' );

    putchar( 's' );

    putchar( 't' );

    putchar( '\r' );

    putchar( '\n' );

	

    //Flash PortB in endless loop

    while( 1 )

    {

        _portb = 0xFF;

        delay_ms( 250 );

        _portb = 0x0;

        delay_ms( 250 );

    }

}