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ET44M210的定时器经典例程

;;========program instruction===========
;;        TCC CLK 6MHZ PRE=256
;;        LEDFLASH=0.5S 
;;        TCC COUNTER
;;=======================================
INCLUDE"ET44M210_REG.H"
      COUNT_VALUE==139
      COUNT0     ==0X40
			ORG		0X0000
			JMP		START
			ORG	  0X0028
			JMP		TCC_INTERRUPT
			ORG		0X0100
;;=======================================
START:
      MOV		A,#COUNT_VALUE    ;TCC PRE COUNT =139
      MOV	  TCC,A
      MOV		A,#100            ;CONT0B TIME =100 >>0.5S
      MOV		COUNT0,A    
      CALL	INIT_IO           ;INITIAL IO PORTA AND TCC MODE
      BS		PRIE,TCCE         ;ENABLE TCC COUNT 
      BS    INTE,TCCOE        ;ENABEL TCC OVERFLOW INTERRUPT
      ENI                     ;ENABEL GLOBAL INTERRUPT
      MOV		A,#0XFF           ;
      MOV		PORTA,A
      JMP		$
;;=======================================
INIT_IO:
      MOV		A,#0X00           ;PORTA FOR OUTPUT
      MOV		IOCA,A
      CLR		INTF              ;CLEAR INTERRUPT FLAG 
      CLR		INTE
      MOV		A,#0X07           ;CLOCK SORCE 6MHZ ,PRE=256
      MOV		TCCC,A
      RET           
;;=======================================
TCC_INTERRUPT:
      CLR		INTF              ;CLR INTERUPT FLAG
      MOV		A,#COUNT_VALUE    ;REPLY WRITE COUNT VALUE
      MOV		TCC,A
      DJZ		COUNT0,FLASH      ;100-1=0?
      JMP		ENDOUT            ;NO
FLASH:                        ;YES
      MOV		A,#100            ;REPLY WRITE COUNT TIME
      MOV		COUNT0,A          ;
      COM		PORTA             ;LED FLASH 
ENDOUT: 
      RETI                    ;INTERRUPT SUBROUTINE GOHOME
;;=======================================
      ORG   0X3FFF
      DW    0X4000
;;==========GAME OVER====================