138621的互置.txt

关于单片机中流水线处理,红绿灯转化等实验

	CURRENT		EQU		30H
		org	0000H
		jmp	MAIN
;*****************************************************
		org	0030H
MAIN:
		mov	p0,#0FFH
		mov	p1,#0FFH
		mov	p2,#0FFH
		mov	p3,#0FFH
	        
		mov	CURRENT,#01H
		clr	p3.3			;clear the common line
		
MAIN_LOOP:
		jb	p2.7,KEY_2		;wait for key down
		call	DELAY
		call	MUN_ADD
		jmp	NEXT_LOOP

KEY_2:
		jb	p2.6,NEXT_LOOP
		call	DELAY
		call	MUN_SUB
		jmp	NEXT_LOOP

NEXT_LOOP:
		call	DISPLAY_NUM
		jmp	MAIN_LOOP
		ret
;**************************************************
DISPLAY_NUM:
		mov	a,CURRENT
		mov	dptr,#TAB_LED
		movc	a,@a+dptr

		mov	p0,a
		mov	p2,#11110111B

		ret
;****************************************************

MUN_ADD:
		mov	a,CURRENT
		mov	dptr,#TAB_ADD
		movc	a,@a+dptr
		mov	CURRENT,a
ret
;*****************************************************
MUN_SUB:
		mov	a,CURRENT
		mov	dptr,#TAB_SUB
		movc	a,@a+dptr
		mov	CURRENT,a
ret
;******************************************************
;Dealy for a interval
DELAY:
		mov	r7,#200					
DELAY_LOOP:
		mov	r6,#200
		djnz	r6,$
		mov	r6,#200
		djnz	r6,$

		djnz	r7,DELAY_LOOP

ret
DELAY_DISP:
		mov	r7,#20
DELAY_DISP_LOOP:
		mov	r6,#200
		djnz	r6,$
		mov	r6,#200
		djnz	r6,$

		djnz	r7,DELAY_DISP_LOOP
		ret
;********************************************************
TAB_LED: DB	0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H
;**************************************************************
TAB_ADD: DB	00H,03H,06H,08H,00H,00H,01H,00H,02H,00H 
;********************************************************
TAB_SUB: DB	00H,06H,08H,01H,00H,00H,02H,00H,03H,00H
;********************************************************
END