Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Register Log in
  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Need help using LCD.

Status
Not open for further replies.
E

edofbrighton

Member
Hi,
Im trying to get my LCD display working (first time i've used one) and i can't figureout whats wrong. The code i'm using seems fine, but I'm not 100%. The only other reason i can think it wouldn't work is the contrast voltage Vo is wrong. I've tried altering it and i can change it between dark squares and no squares, but i never get any characters. Please can someone help me?



here is the code i'm using.
; DELAY EQUATES
CNT EQU 0X25 ;ADDRESS FOR COUNTER
CNT2 EQU 0X26 ;ADDRESS FOR COUNTER2
CNT3 EQU 0X27 ;ADDRESS FOR COUNTER3
CNT4 EQU 0X28 ;ADDRESS FOR COUNTER4
; LCD EQUATES AND DEFINES
#DEFINE DDRE TRISB,7 ;DATA DIRECTION
#DEFINE DDRRS TRISB,5 ;DATA DIRECTION
#DEFINE E PORTB,7 ;ENABLE LINE ON LCD
#DEFINE RS PORTB,5 ;INSTRUCTION/DATA SELECT
#DEFINE RW PORTB,6
TEMP_LCD EQU 0X3A ;STORAGE FOR LCD
LCD EQU PORTC ;LCD DATA PORT
CLRSCR EQU B'00000001' ;COMMAND FOR CLRSCR
HOME EQU B'00000010' ;SENDS CURSOR TO HOME
ON EQU B'00001100' ;TURNS ON THE DISPLAY
OFF EQU B'00001000' ;TURNS THE DISPLAY OFF
LEFT EQU B'00011000' ;LEFT SHIFT
RIGHT EQU B'00011100' ;RIGHT SHIFT
LIN2 EQU B'11000000' ;SETS TO LINE 2



;----------------------------------------
; VECTOR FOR NORMAL START UP.
ORG 0
GOTO START

; MAIN PROGRAM STARTS HERE:
START CLRW ; CLEAR W.
MOVWF PORTA ; ENSURE PORTA IS ZERO BEFORE WE ENABLE IT.
MOVWF PORTB ; ENSURE PORTB IS ZERO BEFORE WE ENABLE IT.
movwf PORTC
BSF STATUS,RP0 ; SELECT BANK 1
MOVLW H'00' ; MASK FOR PORTA FOR ALL OUTPUTS.
MOVWF TRISA ; SET TRISA REGISTER.
MOVLW H'00' ; MASK FOR PORTB FOR ALL OUTPUTS.
MOVWF TRISB ; SET TRISB REGISTER.
MOVLW H'00'
MOVwf TRISC
BCF STATUS,RP0 ; RESELECT BANK 0.

CALL INIT_LCD ; Initialse the LCD
bsf PORTA,2
MOVLW CLRSCR ; Clear the screen
CALL COMMAND ; Initiate the command in the W reg

MOVLW .1 ; wait for 1 second


BsF PORTA,2


BcF PORTA,2

MOVLW 'H' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'e' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'l' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'l' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'o' ; send h
CALL DISPLAY ; Display the w reg on the LCD

MOVLW LIN2 ; Set display to line 2
CALL COMMAND ; Initiate the command in the W reg
MOVLW 'W' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'o' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'r' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'l' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW 'd' ; send h
CALL DISPLAY ; Display the w reg on the LCD
MOVLW '!' ; send h
CALL DISPLAY ; Display the w reg on the LCD

goto $ ; Stop here



;**************************lcdv6******************************
;Porta 1 for the enable and porta 2 for rs/ portb for lcd data
;*************************************************************
;************************************************************
; Initialize the LCD
;************************************************************
INIT_LCD:
MOVLW .200 ;DELAY IN MICROSECONDS
CALL MDELAY ; '' ''
MOVLW B'00111100' ;tell display its two lines
CALL COMMAND ;output to the screen
MOVLW ON ;turn on display
CALL COMMAND ;output to the screen
MOVLW B'00000110' ;shift along every write
CALL COMMAND ;output to the screen
RETURN
;************************************************************
; This routine is to set the lcd to the second line
;************************************************************
SECOND_LINE:
MOVLW LIN2 ;set to line 2
CALL COMMAND ;output to the screen
RETURN
;************************************************************
; THis executes a command in the W reg
;************************************************************
COMMAND:
BCF RS
BCF RW ;command coming
MOVWF LCD ;PUT OUT ONTO PORT
MOVLW .200 ;delay time in microsecs
CALL MDELAY ;wait a while
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
BSF E ;make sure the enable line is up
MOVLW .200 ;delay time
CALL MDELAY ;wait a while
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
BCF E ;clock the data in
MOVLW .200 ;delay time
CALL MDELAY ;wait a while
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
BSF RS ;return to a data input
RETURN
;************************************************************
; This controls the module. When you call this
; routine, the contents of the 'w' register is
; displayed on the LCD screen. It is written in a
; module like this for portability!!
;************************************************************
DISPLAY:
BSF RS
BCF RW ;make sure it will accept data
MOVWF LCD ;send data to lcd
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
BSF E ;make sure the enable line is up
MOVLW .250 ;delay time
CALL MDELAY ;wait a while
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
BCF E ;clock the data in
MOVLW .250 ;delay time
CALL MDELAY ;wait a while
MOVLW .250 ;delay time in microsecs
CALL MDELAY ;WAIT
RETURN




;*************************************************************
; 1 MICROSECOND DELAY
;*************************************************************
MDELAY:
MOVWF CNT ;LOAD DELAY TIME
COUNT:
NOP ;TWO NO OPERATIONS
NOP ;TO OBTAIN THE DELAY
DECFSZ CNT,1 ;DECREMENT THE COUNTER
GOTO COUNT ;GOTO COUNT IF NOT FINISHED
RETURN


;*************************************************************
; SECOND DELAY, A DELAY FOR 1 SECOND!
;*************************************************************
SEC_DELAY:
MOVWF CNT ;LOAD DELAY TIME IN APPROX SECONDS
LOOP5:
MOVLW .1 ;LOAD W WITH .42
MOVWF CNT4 ;AND INTO COUNTER
LOOP4:
MOVLW .198 ;LOAD W WITH .198
MOVWF CNT3 ;AND INTO COUNTER
LOOP3:
MOVLW .199 ;LOAD W WITH .199
MOVWF CNT2 ;AND INTO COUNTER
LOOP2:
DECFSZ CNT2,1 ;DECREMENT THE COUNTER
GOTO LOOP2 ;GOTO LOOP AGAIN
DECFSZ CNT3,1 ;DECREMENT THE OTHER COUNTER
B LOOP3 ;IF NOT FINISHED, GOTO LOOP AGAIN
DECFSZ CNT4,1 ;DECREMENT THE OTHER COUNTER
B LOOP4 ;IF NOT FINISHED, GOTO LOOP AGAIN
DECFSZ CNT,1 ;DECREMENT THE OTHER COUNTER
B LOOP5 ;IF NOT FINISHED, GOTO LOOP AGAIN
RETURN
END
 
hi ED,
Which PIC are you using.?
I have used Pommies codetidy for your code,,, when you post code use the '#' symbol on the menu to keep the formatting...:)

Code: 
; DELAY EQUATES  
CNT    equ    0X25        ;ADDRESS FOR COUNTER
CNT2    equ    0X26        ;ADDRESS FOR COUNTER2
CNT3    equ    0X27        ;ADDRESS FOR COUNTER3
CNT4    equ    0X28        ;ADDRESS FOR COUNTER4
; LCD EQUATES AND DEFINES  
#DEFINE    DDRE    TRISB,7        ;DATA DIRECTION
#DEFINE    DDRRS    TRISB,5        ;DATA DIRECTION
#DEFINE    E    PORTB,7        ;ENABLE LINE ON LCD
#DEFINE    RS    PORTB,5        ;INSTRUCTION/DATA SELECT
#DEFINE    RW    PORTB,6
TEMP_LCD equ    0X3A        ;STORAGE FOR LCD
LCD    equ    PORTC        ;LCD DATA PORT
CLRSCR    equ    B'00000001'    ;COMMAND FOR CLRSCR
HOME    equ    B'00000010'    ;SENDS CURSOR TO HOME
ON    equ    B'00001100'    ;TURNS ON THE DISPLAY
OFF    equ    B'00001000'    ;TURNS THE DISPLAY OFF
LEFT    equ    B'00011000'    ;LEFT SHIFT
RIGHT    equ    B'00011100'    ;RIGHT SHIFT
LIN2    equ    B'11000000'    ;SETS TO LINE 2



;----------------------------------------  
; VECTOR FOR NORMAL START UP.  
    org    0
    goto    START

; MAIN PROGRAM STARTS HERE:  
START    clrw            ; CLEAR W.
    movwf    PORTA        ; ENSURE PORTA IS ZERO BEFORE WE ENABLE IT.
    movwf    PORTB        ; ENSURE PORTB IS ZERO BEFORE WE ENABLE IT.
    movwf    PORTC
    bsf    STATUS,RP0    ; SELECT BANK 1
    movlw    H'00'        ; MASK FOR PORTA FOR ALL OUTPUTS.
    movwf    TRISA        ; SET TRISA REGISTER.
    movlw    H'00'        ; MASK FOR PORTB FOR ALL OUTPUTS.
    movwf    TRISB        ; SET TRISB REGISTER.
    movlw    H'00'
    movwf    TRISC
    bcf    STATUS,RP0    ; RESELECT BANK 0.

    call    INIT_LCD    ; Initialse the LCD
    bsf    PORTA,2
    movlw    CLRSCR        ; Clear the screen
    call    COMMAND        ; Initiate the command in the W reg

    movlw    .1        ; wait for 1 second


    bsf    PORTA,2


    bcf    PORTA,2

    movlw    'H'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'e'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'l'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'l'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'o'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD

    movlw    LIN2        ; Set display to line 2
    call    COMMAND        ; Initiate the command in the W reg
    movlw    'W'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'o'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'r'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'l'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    'd'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD
    movlw    '!'        ; send h
    call    DISPLAY        ; Display the w reg on the LCD

    goto    $        ; Stop here



;**************************lcdv6****************** ************  
;Porta 1 for the enable and porta 2 for rs/ portb for lcd data  
;************************************************* ************  
;************************************************* ***********  
; Initialize the LCD  
;************************************************* ***********  
INIT_LCD: 
    movlw    .200        ;DELAY IN MICROSECONDS
    call    MDELAY        ; '' ''
    movlw    B'00111100'    ;tell display its two lines
    call    COMMAND        ;output to the screen
    movlw    ON        ;turn on display
    call    COMMAND        ;output to the screen
    movlw    B'00000110'    ;shift along every write
    call    COMMAND        ;output to the screen
    return
;************************************************* ***********  
; This routine is to set the lcd to the second line  
;************************************************* ***********  
SECOND_LINE: 
    movlw    LIN2        ;set to line 2
    call    COMMAND        ;output to the screen
    return
;************************************************* ***********  
; THis executes a command in the W reg  
;************************************************* ***********  
COMMAND: 
    bcf    RS
    bcf    RW        ;command coming
    movwf    LCD        ;PUT OUT ONTO PORT
    movlw    .200        ;delay time in microsecs
    call    MDELAY        ;wait a while
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    bsf    E        ;make sure the enable line is up
    movlw    .200        ;delay time
    call    MDELAY        ;wait a while
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    bcf    E        ;clock the data in
    movlw    .200        ;delay time
    call    MDELAY        ;wait a while
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    bsf    RS        ;return to a data input
    return
;************************************************* ***********  
; This controls the module. When you call this  
; routine, the contents of the 'w' register is  
; displayed on the LCD screen. It is written in a  
; module like this for portability!!  
;************************************************* ***********  
DISPLAY: 
    bsf    RS
    bcf    RW        ;make sure it will accept data
    movwf    LCD        ;send data to lcd
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    bsf    E        ;make sure the enable line is up
    movlw    .250        ;delay time
    call    MDELAY        ;wait a while
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    bcf    E        ;clock the data in
    movlw    .250        ;delay time
    call    MDELAY        ;wait a while
    movlw    .250        ;delay time in microsecs
    call    MDELAY        ;WAIT
    return




;************************************************* ************  
; 1 MICROSECOND DELAY  
;************************************************* ************  
MDELAY:
    movwf    CNT        ;LOAD DELAY TIME
COUNT:
    nop            ;TWO NO OPERATIONS
    nop            ;TO OBTAIN THE DELAY
    decfsz    CNT,1        ;DECREMENT THE COUNTER
    goto    COUNT        ;GOTO COUNT IF NOT FINISHED
    return


;************************************************* ************  
; SECOND DELAY, A DELAY FOR 1 SECOND!  
;************************************************* ************  
SEC_DELAY: 
    movwf    CNT        ;LOAD DELAY TIME IN APPROX SECONDS
LOOP5:
    movlw    .1        ;LOAD W WITH .42
    movwf    CNT4        ;AND INTO COUNTER
LOOP4:
    movlw    .198        ;LOAD W WITH .198
    movwf    CNT3        ;AND INTO COUNTER
LOOP3:
    movlw    .199        ;LOAD W WITH .199
    movwf    CNT2        ;AND INTO COUNTER
LOOP2:
    decfsz    CNT2,1        ;DECREMENT THE COUNTER
    goto    LOOP2        ;GOTO LOOP AGAIN
    decfsz    CNT3,1        ;DECREMENT THE OTHER COUNTER
B    LOOP3            ;IF NOT FINISHED, GOTO LOOP AGAIN
    decfsz    CNT4,1        ;DECREMENT THE OTHER COUNTER
B    LOOP4            ;IF NOT FINISHED, GOTO LOOP AGAIN
    decfsz    CNT,1        ;DECREMENT THE OTHER COUNTER
B    LOOP5            ;IF NOT FINISHED, GOTO LOOP AGAIN
    return
    end
 
i'm using the pic16F690.
;
Code: 
 DELAY EQUATES
CNT           EQU 0X25         ;ADDRESS FOR COUNTER
CNT2          EQU 0X26         ;ADDRESS FOR COUNTER2
CNT3          EQU 0X27         ;ADDRESS FOR COUNTER3
CNT4          EQU 0X28         ;ADDRESS FOR COUNTER4
; LCD EQUATES AND DEFINES
#DEFINE     DDRE   TRISB,7     ;DATA DIRECTION
#DEFINE     DDRRS  TRISB,5     ;DATA DIRECTION
#DEFINE     E      PORTB,7     ;ENABLE LINE ON LCD
#DEFINE     RS     PORTB,5     ;INSTRUCTION/DATA SELECT
#DEFINE 	RW	   PORTB,6
TEMP_LCD    EQU 0X3A           ;STORAGE FOR LCD
LCD         EQU PORTC          ;LCD DATA PORT
CLRSCR      EQU B'00000001'    ;COMMAND FOR CLRSCR
HOME        EQU B'00000010'    ;SENDS CURSOR TO HOME
ON          EQU B'00001100'    ;TURNS ON THE DISPLAY
OFF         EQU B'00001000'    ;TURNS THE DISPLAY OFF
LEFT        EQU B'00011000'    ;LEFT SHIFT
RIGHT       EQU B'00011100'    ;RIGHT SHIFT
LIN2        EQU B'11000000'    ;SETS TO LINE 2



;----------------------------------------
	; VECTOR FOR NORMAL START UP.
        ORG     0
        GOTO    START

; MAIN PROGRAM STARTS HERE:
START   CLRW			; CLEAR W.	
        MOVWF   PORTA           ; ENSURE PORTA IS ZERO BEFORE WE ENABLE IT.
        MOVWF   PORTB           ; ENSURE PORTB IS ZERO BEFORE WE ENABLE IT.
		movwf 	PORTC
        BSF     STATUS,RP0      ; SELECT BANK 1
        MOVLW   H'00'           ; MASK FOR PORTA FOR ALL OUTPUTS.
        MOVWF   TRISA           ; SET TRISA REGISTER.
        MOVLW   H'00'           ; MASK FOR PORTB FOR ALL OUTPUTS.
        MOVWF   TRISB           ; SET TRISB REGISTER.
		MOVLW	H'00'
		MOVwf	TRISC
        BCF     STATUS,RP0      ; RESELECT BANK 0.
        
        CALL	INIT_LCD	; Initialse the LCD
		bsf 	PORTA,2
        MOVLW   CLRSCR		; Clear the screen
        CALL    COMMAND		; Initiate the command in the W reg
        
        MOVLW   .1		; wait for 1 second
	

		BsF		PORTA,2
		
      	
		BcF		PORTA,2
        
        MOVLW   'H'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'e'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'l'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'l'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'o'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        
        MOVLW   LIN2		; Set display to line 2
        CALL    COMMAND		; Initiate the command in the W reg
        MOVLW   'W'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'o'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'r'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'l'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   'd'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD
        MOVLW   '!'		; send h
        CALL    DISPLAY		; Display the w reg on the LCD

	goto		$	; Stop here	
	
	
	
;**************************lcdv6******************************
;Porta 1 for the enable and porta 2 for rs/ portb for lcd data
;*************************************************************
;************************************************************
; Initialize the LCD 
;************************************************************
INIT_LCD:
MOVLW .200                         ;DELAY IN MICROSECONDS
CALL MDELAY                        ; '' ''
MOVLW B'00111100'                  ;tell display its two lines
CALL COMMAND                       ;output to the screen
MOVLW ON                           ;turn on display
CALL COMMAND                       ;output to the screen
MOVLW B'00000110'                  ;shift along every write
CALL COMMAND                       ;output to the screen
RETURN
;************************************************************
; This routine is to set the lcd to the second line 
;************************************************************
SECOND_LINE:
MOVLW LIN2                     ;set to line 2
CALL COMMAND                   ;output to the screen
RETURN
;************************************************************
; THis executes a command in the W reg
;************************************************************
COMMAND:
BCF RS  
BCF	RW                       ;command coming
MOVWF LCD                      ;PUT OUT ONTO PORT
MOVLW .200                     ;delay time in microsecs
CALL MDELAY                    ;wait a while
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
BSF E                          ;make sure the enable line is up 
MOVLW .200                     ;delay time
CALL MDELAY                    ;wait a while
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
BCF E                          ;clock the data in
MOVLW .200                     ;delay time
CALL MDELAY                    ;wait a while
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
BSF RS                         ;return to a data input
RETURN
;************************************************************
; This controls the module. When you call this 
; routine, the contents of the 'w' register is 
; displayed on the LCD screen. It is written in a 
; module like this for portability!! 
;************************************************************
DISPLAY:
BSF RS     
BCF	RW                    ;make sure it will accept data
MOVWF LCD                      ;send data to lcd
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
BSF E                          ;make sure the enable line is up 
MOVLW .250                     ;delay time
CALL MDELAY                    ;wait a while
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
BCF E                          ;clock the data in
MOVLW .250                     ;delay time
CALL MDELAY                    ;wait a while
MOVLW .250                     ;delay time in microsecs
CALL MDELAY                    ;WAIT
RETURN


	
	
;*************************************************************
; 1 MICROSECOND DELAY 
;*************************************************************
MDELAY:
MOVWF CNT          ;LOAD DELAY TIME
COUNT:
NOP         ;TWO NO OPERATIONS
NOP                ;TO OBTAIN THE DELAY
DECFSZ CNT,1       ;DECREMENT THE COUNTER
GOTO COUNT         ;GOTO COUNT IF NOT FINISHED
RETURN


;*************************************************************
; SECOND DELAY, A DELAY FOR 1 SECOND! 
;*************************************************************
SEC_DELAY:
MOVWF CNT           ;LOAD DELAY TIME IN APPROX SECONDS
LOOP5:
MOVLW .1    ;LOAD W WITH .42
MOVWF CNT4          ;AND INTO COUNTER
LOOP4:
MOVLW .198   ;LOAD W WITH .198
MOVWF CNT3          ;AND INTO COUNTER
LOOP3:
MOVLW .199   ;LOAD W WITH .199
MOVWF CNT2          ;AND INTO COUNTER
LOOP2:
DECFSZ CNT2,1       ;DECREMENT THE COUNTER
GOTO LOOP2          ;GOTO LOOP AGAIN
DECFSZ CNT3,1       ;DECREMENT THE OTHER COUNTER
B LOOP3             ;IF NOT FINISHED, GOTO LOOP AGAIN
DECFSZ CNT4,1       ;DECREMENT THE OTHER COUNTER
B LOOP4             ;IF NOT FINISHED, GOTO LOOP AGAIN
DECFSZ CNT,1        ;DECREMENT THE OTHER COUNTER
B LOOP5             ;IF NOT FINISHED, GOTO LOOP AGAIN
RETURN
END
 
hi,
i still can't get it to work. i cleared all then bits in the ansel register but still no joy. let me know if there's anything else you can think of.

thanks again,
ed.
 
Code: 
MOVLW .1 ; wait for 1 second <--- It will not be doing any such thing.


BsF PORTA,2


BcF PORTA,2

MOVLW 'H' ; send h     <--- Because you just MOVed 'H' into it.
 
Code: 
CLRF ANSEL ;digital I/O
with out that not much is going to happen
 
Status
Not open for further replies.

Similar threads

MrDEB
  • Question
using PICKIT2 AND 3 issues
Replies
6
Views
2K
Ian Rogers
Ian Rogers
MrDEB
  • Question
implementing an INTERRUPT using SF
Replies
9
Views
2K
MrDEB
MrDEB
A
  • Question
Help me to Program LED with Switch using external interrupt in STC89C52RC Micrcontroller
Replies
5
Views
2K
Ian Rogers
Ian Rogers
DogFlu66
Using the IDE simulator (Oshonsoft).
Replies
15
Views
3K
DogFlu66
DogFlu66
A
  • Question
Need Help : STC89C52 Blinking Led Program through STC-ISP Software
Replies
7
Views
2K
Driveer
D

Latest threads

New Articles From Microcontroller Tips

Back
Top