Writing a Counter to any PORT

Writing a counter to a PORT

Code:

TITLE "Write Count to Port D"
list p = 16f877
include <p16f877.inc>
DELAY_VHI EQU H'30'
DELAY_HI EQU H'31'
DELAY_LO EQU H'32'
COUNT EQU H'33'
ORG H'00'
NOP
GOTO START 

ORG 0x20
START BCF STATUS,RP0; BANK 0
CLRF PORTD; INITALIZE PORTC BY CLEARING OUTPUT

DATA LATCHES
BSF STATUS,RP0; SELECT BANK1
MOVLW 0X00;W REG=00
MOVWF TRISD;SET RD AS OUTPUTS
BCF STATUS,RP0; BANK 0
CLRF COUNT; COUNT = 0 

MAIN MOVF COUNT,W; GET COUNT
MOVWF PORTD; OUTPUT W REG TO PORTD
CALL DELAY
CALL DELAY
INCF COUNT; COUNT= COUNT+1
GOTO MAIN

 ; SUBRoUTINES
DELAY  
MOVLW 0X01
MOVWF DELAY_LO
MOVLW 0XA1
MOVWF DELAY_HI
MOVLW 0XFF
MOVWF DELAY_VHI

BIG
OUTER
INNER

INCFSZ DELAY_LO,1
GOTO INNER
INCFSZ DELAY_HI,1
GOTO OUTER
INCFSZ DELAY_VHI
GOTO INNER
RETURN
END

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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