main.asm

base on the mc9sdg128b LCD display

;*****************************************************************
;* This stationery serves as the framework for a                 *
;* user application (single file, absolute assembly application) *
;* For a more comprehensive program that                         *
;* demonstrates the more advanced functionality of this          *
;* processor, please see the demonstration applications          *
;* located in the examples subdirectory of the                   *
;* Metrowerks CodeWarrior for the HC12 Program directory         *
;*****************************************************************

; export symbols
            XDEF MAIN        ; export 'Entry' symbol
            ABSENTRY MAIN    ; for absolute assembly: mark this as application entry point

; include derivative specific macros
            INCLUDE 'mc9s12dg128.inc'

ROMStart    EQU  $4000  ; absolute address to place code/constant data

					  

; variable/data section
            ORG RAMStart
; Insert here your data definition. For demonstration, temp_byte is used.
temp_byte   ds.b 1


; code section
            ORG ROMStart
MAIN:
            CLI                ; enable interrupts		
            MOVB #1,temp_byte  ; just some demonstration code
            NOP  
            
                          ; Insert here you own code
            LDD #$FFFF
            STD DDRAB
                         
				 	 BCLR PORTA,mPORTA_BIT7
					  CALL DELAY
					  
					  BSET PORTA,mPORTA_BIT7
					  CALL DELAY
					  
					  LDAA #$30
					  STAA $1000
					  CALL WRI
					  CALL DELAY
					  
					  LDAA #$0C
					  STAA $1000
					  CALL WRI
					  CALL DELAY
					  
					  LDAA #$01
					  STAA $1000
					  CALL WRI
					  CALL DELAY
					  
					  LDAA #$06
					  STAA $1000
					  CALL WRI
					  CALL DELAY
					  
					  

 
					  
					  
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
DISPLAY:LDX #$30
        STX $1002			 ;;R2		      
        LDY #$30
        STY $1006
                 									 
        LDAA #$80			 ;;COMM
        STAA $1000      
        CALL WRI
        
DISP:   STX $1002
        CALL WRD        
        CALL DELAY 
        LDX $1002    
        DBNE X,DISP        
        CALL DELAY
         
                 
DD:  		DBNE X,DD
        DEX
        JMP DD
        
WRI:BCLR 	PORTA,mPORTA_BIT4
    BSET 	PORTA,mPORTA_BIT5
WRI1:
     LDAA #$FF
		 STAA   PORTB
		 BSET 	PORTA,mPORTA_BIT6 
	
		 LDAA PORTB
		 BCLR 	PORTA,mPORTA_BIT6
		 LDAB #$80
		 STAB $1004
		 ANDA $1004
		 BEQ WRI1
		 LDAA #$FF
		 STAA DDRB	
		 BCLR 	PORTA,mPORTA_BIT5
		 LDAA $1000
		 STAA PORTB
		 BSET 	PORTA,mPORTA_BIT6
		 BCLR 	PORTA,mPORTA_BIT6
		 RTC
		 

WRD:BCLR 	PORTA,mPORTA_BIT4
    BSET 	PORTA,mPORTA_BIT5
WRD1:LDAA #$FF
     STAA PORTB
     BSET 	PORTA,mPORTA_BIT6
    
     LDAA PORTB
     BCLR 	PORTA,mPORTA_BIT6
         
     LDAB #$80
		 STAB $1005
		 ANDA $1005
    BEQ WRD1
		 LDAA #$FF
		 STAA DDRB	
		 BSET PORTA,mPORTA_BIT4
		 BCLR 	PORTA,mPORTA_BIT5
		 LDAA $1007
		
		 STAA PORTB
		 INCA
		 STAA $1007
		 BSET 	PORTA,mPORTA_BIT6
		 BCLR 	PORTA,mPORTA_BIT6
		 RTC 


DELAY:LDY #$0006
DELAY0:LDX #$FFFF
DELAY1:DBNE X, DELAY1        
       DBNE Y, DELAY0
         RTC
        
        
        
        
					
					
					




           


;**************************************************************
;*                 Interrupt Vectors                          *
;**************************************************************
  ORG $FFFE

  fdb     MAIN      ; Reset

   END