; ECE 376 Lecture #4: Binary Inputs
; Up Counter

#include <p18f4620.inc> 

COUNT equ 0

    org 0x800

    movlw 0xFF
    movwf TRISB
    clrf TRISD
    movlw 0x0F
    movwf ADCON1
    
    clrf  COUNT
    clrf  PORTD

; while(RB0 == 1);

L1:
    btfsc  PORTB,0
    goto   L1

; while(RB0 == 0);

L2:
    btfss  PORTB,0
    goto   L2

; Rising edge detected
; PORTD = PORTD + 1;

    incf   COUNT,F
    movff  COUNT, PORTD

    goto   L1

    end