PORTB vs PORTB.0

[xzolian]

Can some one tell me why this code works

OSCCON = %01100010
ADCON1 = %01111111

    TRISB = 0
        
    loop:   
        Pause 500       ' Wait .5 second
        PORTB.3 = 1
        Pause 500       ' Wait .5 second
        PORTB.3 = 0
    Goto loop
    
END

And this code works as well ...

OSCCON = %01100010
ADCON1 = %01111111

    TRISB = 0
        
    loop:   
        Pause 500       ' Wait .5 second
        PORTB = %11111111
        Pause 500       ' Wait .5 second
        PORTB = %00000000
    Goto loop
    
END

But this code does not...

OSCCON = %01100010
ADCON1 = %01111111

    TRISB = 0
        
    loop:   
        Pause 500       ' Wait .5 second
        PORTB = 1
        Pause 500       ' Wait .5 second
        PORTB = 0
    Goto loop
    
END

I tried searching for the answer and I could not find anything. Maybe I don't know how to search properly.

Thanks in advance,
Matt

p.s. I'm using a pic18f1320 and programming it using the PICKIT 2
p.s.s. Sorry if this post is in the wrong forum

[mister_e]

the second will toggle the PORTB.0 bit while the first toggle PORTB.3 bit. If you don't have LED on all PORTB pins, the problem is as this simple.

Or once again i miss something obvious

[xzolian]

I have placed an LED on pin 3 of port b. When I used these statements:
PORTB.3 = 1 or PORTB = %11111111
The LED on pin 3 of port b turns on.

But when I use this statement:
PORTB = 1
The LED does not turn on.

How can I set all of port b high or low with one statement?

[Ron Marcus]

PORTB = 1 = %00000001
PORTB = 0 = %00000000
Each bit equals a port pin. You are changing PORTB.0 only. If you wanted to change only bit 3, then it would be PORTB = %00001000

[keithdoxey]

PORTB = 1 = %00000001
PORTB = 0 = %00000000
Each bit equals a port pin. You are changing PORTB.0 only. If you wanted to change only bit 3, then it would be PORTB = %00001000

Or PORTB = 8

[xzolian]

So if I do this...
PORTB = 255

Would it set all of PORTB high?

[mister_e]

Yes indeed!

PORTB=255 ' decimal
PORTB=$FF 'Hexadecimal
PORTB=%11111111 ' Binary

P.S.: it's a good practice to set your PIC configuration fuses in your code.

        '
        '       Pic Configuration
        '       =================
        asm
        
        __CONFIG  _CONFIG1H, _IESO_ON_1H & _FSCM_OFF_1H & _INTIO2_OSC_1H
                ;
                ;_IESO_ON_1H       Internal External Oscillator Switch Over mode enabled
                ;_FSCM_OFF_1H      Fail-Safe Clock Monitor disabled
                ;_INTIO2_OSC_1H    Internal RC, OSC1 as RA7, OSC2 as RA6

        __CONFIG  _CONFIG2L, _PWRT_ON_2L & _BOR_ON_2L & _BORV_27_2L
                ;
                ;_BORV_27_2L       BOR Voltage - 2.7v
                ;_BOR_ON_2L        Brown-out Reset enabled
                ;_PWRT_ON_2L       Power-up Timer enabled

        __CONFIG  _CONFIG2H, _WDT_OFF_2H & _WDTPS_32K_2H
                ;
                ;_WDT_OFF_2H       Watch Dog Timer disabled
                ;_WDTPS_32K_2H     1:32,768    WDT Postscaler ratio
                
        __CONFIG  _CONFIG3H, _MCLRE_ON_3H
                ;
                ;_MCLRE_ON_3H      MCLR enabled, RA5 input disabled
                
        __CONFIG  _CONFIG4L, _DEBUG_OFF_4L & _LVP_OFF_4L & _STVR_ON_4L
                ;
                ;_DEBUG_OFF_4L     BacKground deBUGger disabled
                ;_LVP_OFF_4L       Low Voltage Prgramming disabled
                ;_STVR_ON_4L       Stack over/underflow Reset enabled
                        
        __CONFIG  _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L

        __CONFIG  _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H

        __CONFIG  _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L
                
        __CONFIG  _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H & _WRTD_OFF_6H
                
        __CONFIG  _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L
               
        __CONFIG  _CONFIG7H, _EBTRB_OFF_7H
        ENDASM

There's a whole thread about that bellow. Take your time to read it.
http://www.picbasic.co.uk/forum/showthread.php?t=543

[xzolian]

Thanks for the help everyone.