;
; Do a poor job of emulating the Student ID
; CPU operation

  INCLUDE "p16f873.inc"

;  Register Usage
 CBLOCK 0x020	;  registers start after special registers
  odd,out    ; reserve space for two byte variables
 ENDC


 __CONFIG _CP_OFF & _DEBUG_OFF & _WRT_ENABLE_OFF & _CPD_OFF & _LVP_OFF &  _PWRTE_ON & _WDT_OFF & _XT_OSC 
 
; C Program equivalent
;  
;  unsigned char odd, out ;
;
;     odd = 0;
;     do {   
;      if (odd == 0) {
;        out = 4;  /* even sequence */
;        out = 8;
;        out = 0;
;        out = 2;
;        out = 8;
;	 } else {
;        out = 5; /* odd sequence */
;        out = 7;
;        out = 1;
;        out = 9;
;        }
;     } while (1);  /* infinite loop */

		     
  org    0

;
; odd = 0;   
;
  clrf odd      ; odd <- 0, do not assume '0' value of register 
               ; value after reset
;   bsf odd,0   ; uncomment this line to test odd seq

; do 
; if (odd == 0) 
;

top
  btfsc  odd,0  ; skip next instruction if bit 0 is '0'
  goto odd_seq

;start even sequence

;  out = 4;

   movlw 4         ; w <- 4
   movwf out       ; out <- w

;  out = 8;

   movlw 8         ; w <- 8
   movwf out       ; out <- w

;  out = 0;

   movlw 0         ; w <- 0
   movwf out       ; out <- w

;  out = 2;

   movlw 2         ; w <- 8
   movwf out       ; out <- w

;  out = 8;

   movlw 8         ; w <- 8
   movwf out       ; out <- w

   goto  top      ; loop forever

;; start odd sequence

odd_seq

;  out = 5;

   movlw 5         ; w <- 5
   movwf out       ; out <- w

;  out = 7;

   movlw 7         ; w <- 7
   movwf out       ; out <- w

;  out = 1;

   movlw 1         ; w <- 1
   movwf out       ; out <- w

;  out = 9;

   movlw 9         ; w <- 9
   movwf out       ; out <- w

  goto   top	  ; loop forever


  end

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