On the 18f2520, some of portb can be analog. You need to either set config
bits or initialize it to be all digital. Here's some sample code from the
datasheet:

CLRF PORTB ; Initialize PORTB by
; clearing output
; data latches
CLRF LATB ; Alternate method
; to clear output
; data latches
MOVLW 0Fh ; Set RB<4:0> as
MOVWF ADCON1 ; digital I/O pins
; (required if config bit
; PBADEN is set)
MOVLW 0CFh ; Value used to
; initialize data
; direction
MOVWF TRISB ; Set RB<3:0> as inputs
; RB<5:4> as outputs
; RB<7:6> as inputs



Harold


> Hello,
> Running this code in MPLAB using the C18 compiler,
>
> #include <p18cxxx.h> // or <p18f2520.h>
> #pragma config WDT = OFF
>
> void main(void){
>          TRISB = 0;
>
>          PORTB = 0;
>          PORTB = 0x5A;
>
>          while(1);
>  }
>
>    I get the value of 0x40 in PORTB in the while loop instead of 0x5A.
> I'm
> using MPLAB SIM to debug the code.  Whatever I set PORTB to in my main
> function, it never ends up being that value when I debug it.
>    Could anyone please let me know what might be causing the odd value?
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