Port A pins

[Eric123]

I am just getting into microcontroller programing and am haveing trouble geting the port A pins to go high and low. I dont really understand how to get thoes pins to go high and low. My micorcontroller is a pic16f84. If someone could give me the assembly code to make a specific A pin go high, and descrive exactly what is going on in the code I would appreciate it.

Thanks

[mister_e]

Few start point
http://www.picbasic.co.uk/forum/show...hlight=dummies

;	Super dooper LED blink with 10F200
;	==================================
;	Steve Monfette
;	Mister E 
;	23/03/2006

;	As if the world really needed it... well it's still usefull
;	to learn a bit how to play and waste your time using the
;	annoying assembler language.  BTW 10F200 are just too small
;	to accept any other language.

;	This program will use a software loop delay, called by a macro
;	wich will pass the delay to produce... at least not too basic and
;	some part could be usefull.. one day if someones really try to figure
;	out how it works... just kidding.. i know EVERYBODY WILL TRY ;o)
;	---------------------------------------------------------------------

	INCLUDE "P10F200.INC"	; load all needed stuff 

;	PIC configuration
;	=================
	__Config _MCLRE_ON & _CP_OFF & _WDT_OFF
	
;	Hardware assignement
;	====================
	#define Led			GPIO,2	
	
;	RAM assignement 
;	===============
; 	hands-up those who discover figure 4-3

	cblock 0x10				
		loop		
		UserDelay
	endc

;	Macro Definition
;	================
;	Be carefull, the following macro is extremely difficult to understand 
;	and contain tons of information... always refer to MPASM book to 
;	understand all trick it do.. mpff mkay i stop it :o)

;	Nothing fancy, the macro will just pass the parameter to the 1 msec
;	subroutine -> Delay <- Not much.  What could she do more to be still
;	code efficient anyway?

Delayms	macro User				
	movlw	User		; put User wish somewhere
	movwf	UserDelay	; copy it to something
	call 	Delay		; do the delay	
        endm				
    
;	///////////////////////////////////////|\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
;					Program Begining	
;	///////////////////////////////////////|\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

;	Hardware configuration
;	======================
	ORG 0			; 
	movwf	OSCCAL		; Load OSCCAL value

	movlw	b'11111011' 	;
	TRIS	GPIO		; Set GP2 as Output

	movlw	b'11011111' 	; TOCS=internal => to use GP2 as Output 
	OPTION			; => datasheet section 4.5	

;	Tha ****!
;	=========
;	The exciting part of the program... how to blink a LED
Start
	bsf 	Led		; Enable LED
	Delayms d'250'		; do 250 mSec Delay	
	bcf		Led	; Disable LED
	Delayms	d'250'		; do 250 mSec Delay
	goto 	Start		; Have fun forever, enjoy the show

;	Delay Subroutine
;	================
;	The main program call the macro, the macro call this routine
Delay	
    	movlw   d'250'		; 1 mSec base
    	movwf   loop  		;	loop

   	;	DelayLoop
   	;	---------
    	nop  			; do nothing                (1 Cycle)
    	decfsz  loop,f	    	; base loop finished?       (1 cycle if NO, 2 cycle if YES)
    	goto    $-2 	  	; NO... jump 2 lines before (2 cycles)
    				;			    -------------------------------
    				;               Killed about 4 cycles * 250times @1uSec = 1mSec
    				; 
    	decfsz	UserDelay,f 	; DelayFinish?
    	goto 	$-6		; NO... do it again, jump 6 line before
    	retlw	0		; Astalavista baby
    	end

[AMay]

Perhaps you have figured it out by now.

Anyway, use "poke" + the "A" register + a binary discription of how you want the 4 pins.

If you want them all high:

POKE $5,%1111

All low:

POKE $5,%0000

[mister_e]

i guess you misread the following part

If someone could give me the assembly code to make a specific A pin go high, and descrive exactly what is going on in the code I would appreciate it.