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