CLRF PORTA                       ; Initialize PORTA by clearing output data latches

CLRF LATA             ; Alternate method to clear output data latches

MOVLW 0Fh                         ; Configure A/D 
MOVWF ADCON1               ; for digital inputs

MOVLW 07h                         ; Configure comparators
MOVWF CMCON                ; for digital input

MOVLW 0CFh                      ; Value used to
; initialize data
; direction
MOVWF TRISA                    ; Set RA<3:0> as inputs
; RA<5:4> as outputs

PORTA = 0 ;                          // Initialize PORTA by clearing output data latches
LATA = 0 ;                             // Alternate method to clear output data latches
ADCON1 = 0x0F ;                 // Configure A/Dfor digital inputs(=00001111)
CMCON = 0x07 ;                  // Configure comparatorsfor digital input
TRISA = 0xCF ;                     //Value used to initialize datadirection(=11001111)
//Set RA<3:0> as inputs ,RA<5:4> as outputs

/********************************************************************
FLASHING LED
----------------------
In this project an LED is connected to bit 0 of PORT A (RA0) of a PIC18F2550 type microcontroller (any other PIC microcontroller can also be used in this project). The microcontroller is operated from an 8MHz crystal. The LED is flashed continuously with 1 second intervals.
*****************************************************************/
void main()
{

ADCON1 = 0x0F ;                 // Configure A/Dfor digital inputs(=00001111)
CMCON = 0x07 ;                  // Configure comparatorsfor digital input
TRISA = 0;                             // Configure PORT A as outputs

for(;;)                                     // FOREVER loop
{
PORTA.RA0 = 1;                  // Turn ON LED
Delay_Ms(1000);                   // Wait 1 second
PORTA.RA0 = 0;                  // Turn OFF LED
Delay_Ms(1000); // Delay 1 second
}
}

CLRF PORTB           ; Initialize PORTB by clearing output data latches
CLRF LATB              ; Alternate method to clear output data latches
 
MOVLW 0Eh                        ; Set RB<4:0> as
MOVWF ADCON1               ; digital I/O pins
; (required if config bit
; PBADEN is set)
MOVLW 0CFh                      ; Value used to
; initialize data
; direction
MOVWF TRISB                    ; Set RB<3:0> as inputs
; RB<5:4> as outputs
; RB<7:6> as inputs

LATB = 0 ;                             // Clear output data latches
ADCON1 = 0x0E ;                //Set RB<4:0> as digital I/O pins
TRISB = 0xCF ;                   //Set RB<3:0> as inputs,
//RB<5:4> as outputs ,
//RB<7:6> as inputs

 
/********************************************************************

BINARY COUNTING UP LEDs 
-----------------------------------------
In this project 8 LEDs are connected to PORT B of a PIC18F2550 type microcontroller (any other PIC microcontroller can also be used in this project). The microcontroller is operated from an 8MHz crystal.
In this project the LEDs count up in binary from 0 to 255 and then back to 0 with one second delay between each count.
****************************************************************/
void main()
{
unsigned char Cnt = 0;          // Declare and initialise Cnt
 
 
ADCON1 = 0x0E ;                //Set RB<4:0> as digital I/O pins
TRISB = 0;                             // Configure PORT B as outputs
for(;;)                                     // FOREVER loop 
{
PORTB = Cnt;           // SendCnt to PORT B
Delay_Ms(1000);       // Delay 1 second
Cnt++;                        // Increment Cnt
}
}

CLRF PORTC           ; Initialize PORTC by
; clearing output
; data latches
CLRF LATC ; Alternate method
; to clear output
; data latches

MOVLW 07h             ; Value used to
; initialize data
; direction
MOVWF TRISC        ; RC<5:0> as outputs
; RC<7:6> as inputs