;Sending "YES" to Hyperterminal via Serial COM1 (SCI1) on Dragon12+ board
;Serial COM1 (SCI1) is the RS232 next to the power connection, and COM0(SCI0)is next LCD. 
;You need two x86 PCs for this program 
;PC#1 for CodeWarrior/Serial Monitor uses COM0 to communicate(download/run) with Dragon12 board,and 
;PC#2 for HyperTerminal to display data via COM1  
;Modfied from Example 10-3 and 10-5 in HCS12 book by Mazidi & Causey
;This program must be downloaded into Dragon12 via COM0 (SCI0) using HCS12 Serial Monitor
;Use the usual steps in CodeWarior. a) Make (F7) b) Set SW7 =00 (LOAD) position, 
;(c)use Debug (F5) to download.  
;After it is downloaded, d) connect the 2nd x86 PC serial port to COM1 of Dragon12+ board
;bring up e)HyperTerminal (or Tera Term in Windows Vista and Windows 7) on the 2nd x86 PC, 
;and f)press F5 in Debug step C to start running this program via Serial Monitor.     

;Serial Monitor uses COM0 to download (LOAD,SW7=00) and works at 48 MHz
;We use COM0(SCI0) to download and run using Serial Monitor on the main x86 PC 
;and use COM1(SCI1)to connect to the 2nd x86 PC to display data on HyperTerminal at the same time. 
;The program sends "YES" to HyperTerminal of the 2nd x86 PC via COM1(SCI1)
   



        ABSENTRY Entry        ; for absolute assembly: mark this as application entry point
    
; Include derivative-specific definitions 
		INCLUDE 'mc9s12dp256.inc'     ;CPU used by Dragon12+ board
 

;code section
      ORG   $4000     ;Flash ROM address for Dragon12+
Entry:
	    LDS   #$4000    ;Stack
      
  
  ;Serial Monitor used for LOAD works at 48MHz  
  ;We use Serial Monitor to download and execute the program via COM0          
    	LDAA	#$0		
     	STAA  SCI1BDH    	
	    LDAA	#156		   ;For 9600 on Serial COM1
     	STAA  SCI1BDL    ;48MHz/2=24MHz, 24MHz/16=1.5MHz and 1.5MHz/9600=156 	
     	LDAA  #0	   	
     	STAA	SCI1CR1	
     	LDAA  #$0C	   	
     	STAA	SCI1CR2	
     	
OVER	LDAA  #'Y'		
	    JSR	TRANS1
	    LDAA  #'E'		
	    JSR	TRANS1
	    LDAA  #'S'		
	    JSR TRANS1
	    LDAA  #' '		
	    JSR TRANS1
	    
	    BRA	OVER
;----------		
TRANS1 
HERE: BRCLR	SCI1SR1, mSCI0SR1_TDRE, HERE	
  	  STAA	SCI1DRL	
	    RTS		                  
 
;-------------------

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