[PIC] mplab simulator problem

[Resistor123]

I am trying to simulate one on the examples (using pic 16F690).

The program should make Port C , bits 0,1,2,3 light (hi) one at a time.

Only Port C, bits 2 and 3 light bits 0 and 1 are off (lo) all the time (using the simulator). Why?

The program is:

; PICkit 2 Lesson 3 - "Rotate"
;
; Extends Lesson 2 to sequence through the display LEDs.
;
; *******************************************************************
; * See Low Pin Count Demo Board User's Guide for Lesson Information*
; *******************************************************************
; * NOTE: The PIC16F690 requires the AC162061 header for debugging  *
; *******************************************************************

#include <p16F690.inc>
     __config (_INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _BOR_OFF & _IESO_OFF & _FCMEN_OFF)

     cblock 0x20
Delay1              ; Assign an address to label Delay1
Delay2
Display             ; define a variable to hold the diplay
     endc
     
     org 0
Start:
     bsf       STATUS,RP0          ; select Register Page 1
     clrf      TRISC               ; make IO PortC all output
     bcf       STATUS,RP0          ; back to Register Page 0
     movlw     0x08
     movwf     Display
MainLoop:
     movf      Display,w           ; Copy the display to the LEDs
     movwf     PORTC
OndelayLoop:
     decfsz    Delay1,f            ; Waste time.  
     goto      OndelayLoop         ; The Inner loop takes 3 instructions per loop * 256 loopss = 768 instructions
     decfsz    Delay2,f            ; The outer loop takes and additional 3 instructions per lap * 256 loops
     goto      OndelayLoop         ; (768+3) * 256 = 197376 instructions / 1M instructions per second = 0.197 sec.
                                   ; call it a two-tenths of a second.
     
     bcf       STATUS,C            ; ensure the carry bit is clear
     rrf       Display,f
     btfsc     STATUS,C            ; Did the bit rotate into the carry?
     bsf       Display,3           ; yes, put it into bit 3.
     goto      MainLoop
     end

 

[betwixt]

Check the ANSEL and ANSELH registers. I haven't looked at the data sheet but it's possible they are configured by default to analog mode.

Brian.