MPLAB 8.85 problem PORT SETTING AS INPUT

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Noman Yousaf

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i m using MPLAB 8.85.
can anybody tell me that how can i use or change the state of ports my self? is that possible or not.
i just wrote a program to turn on an led by making a port hi but when i make the port line hi, in "SFR register" window it goes lo itself without any action. i m sending the code and screen short of the mplab screen.


SOFTWARE IS AS FOLLOWS.

Code ASM - [expand]
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LIST   P=PIC16F676
                PROCESSOR  16F676
                #include "P16F676.INC"
 
 
        __CONFIG   _CP_OFF & _CPD_OFF & _BODEN_OFF & _MCLRE_OFF & _WDT_OFF & _PWRTE_ON & _INTRC_OSC_NOCLKOUT
;THIS IS SIMPLE SOFTWARE TO TURN ON THE LED (PORTC,0)BY CHANGING THE PORTA,5 
                ORG             0
 
                        IN_SW   EQU             5               ;PORTA,5 AS INPUT
 
                        LED             EQU             0               ;PORTC,0 OUTPUT
 
 
 
                        BSF                     STATUS,RP0              ;SELECT BANK1
                        CLRF            TRISC                   ;MAKE PORTC OUTPUT
                        MOVLW           0FFH                    ;MAKE WREG 0FFH
                        MOVWF           TRISA                   ;MAKE PORTA INPUT
                        CLRF            ANSEL                   ;MAKE ALL ADC LINES AS DIGITAL INPUT
 
                        BCF                     STATUS,RP0              ;SELECT BANK0
                        
                        
MAIN
                        BTFSS           PORTA,IN_SW
                        GOTO            MN1
                        BSF                     PORTC,LED
                        GOTO            MAIN
 
MN1
                        BCF                     PORTC,LED
                        GOTO            MAIN
 
 
        END
 
Last edited by a moderator:

When the PC is pointing to 1st instruction in MAIN then you have to set PORTA as 00000001 in SFR window. Also see if you can see IN_SW in variables window. Try to set it there. For better help zip and post your mplab project files.
 

Noman Yousaf said:
File is attached
please note that porta,5 is input.
Click to expand...

Hi,

You need to use Mplab, Debugger , Stimulus - a simple example is shown with your code in the screenshot.

Just Step though your code and Fire the change to pin RA5.

See Mplabs Help, Mplab Sim , Stimulus.

This link is also helpful
**broken link removed**
 

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