;Sending "YES" to Hyperterminal (or Tera Terminal) via Serial COM0 (SCI0) on HCS12 MCU Module
;The HCS12 MCU Module comes with one serial port with DB-9 connector ready to go. 
;On HCS12 MCU Module, the SCI0 pins of TX and RX of HCS12 are connected to DB-9 COM port
;It is done via a MAX232-compatible chip for converting TTL to RS232. 
;They SCI0 signales are accessed via both COM-USB and COM_EN jumpers. They are located close to USB connection.

;Make sure COM-USB and COM_EN jumpers are set. Also Make sure VB jumper for PWR_SEL is set too
;Also make sure the VB jumper for Power_SEL (next to power jack) is set since it is powered via USB cable
;connect the COM port of MCU Module to COM port of x86 PC via a via null serial cable. 
;If you do not have COM port on your x86 PC, then you need a USB-COM converter.
;Configure the HyperTerminal (for XP) or Tera Terminal (for Vista or Windows 7. See tutorial on this website).  

;//Modfied from Example 10-3 in HCS12 textbook by Mazidi & Causey
;//In codewarrior, Make sure you are in TBDML Mode before downloading 
;//Press F7 (to Make), then F5(Debug) to downLOAD,and F5 once more to start the program execution
     

   

        ABSENTRY Entry        ; for absolute assembly: mark this as application entry point
    
;Include derivative-specific definitions 
		INCLUDE 'mc9s12dt256.inc'     ;CPU used by Axiom CPU Module board
 

;code section
      ORG   $4000     ;Flash ROM address 
Entry:
	    LDS   #$4000    ;Stack
      
             
    	LDAA	#$0		
     	STAA  SCI0BDH    	
	    LDAA	#13		
     	STAA  SCI0BDL    ;4MHz/2=2MHz, 2MHz/16=125,000 and 125,000/9600=13 	
     	LDAA  #0	   	
     	STAA	SCI0CR1	
     	LDAA  #$0C	   	
     	STAA	SCI0CR2	
     	
OVER	LDAA  #'Y'		
	    JSR	TRANS
	    LDAA  #'E'		
	    JSR	TRANS
	    LDAA  #'S'		
	    JSR TRANS
	    LDAA  #' '		
	    JSR TRANS
	    
	    BRA	OVER
;----------		
TRANS 
HERE: BRCLR	SCI0SR1, $80, HERE	
  	  STAA	SCI0DRL	
	    RTS		                  
 
;-------------------

            
;**************************************************************
;*                 Interrupt Vectors                          *
;**************************************************************
      ORG   $FFFE
      DC.W  Entry     ;Reset Vector. CPU wakes here and it is sent to start of the code at $4000