十六进制的99.txt

关于单片机中流水线处理,红绿灯转化等实验

	CURR_NUM	EQU	30H	;hex
	org	0000H
	jmp	MAIN
;*******************************************************
	org	0030H	;start program from 0030H
MAIN:
	mov	p0,#0FFH
	mov	p1,#0FFH
	mov	p2,#0FFH
	mov	p3,#0FFH

	mov	CURR_NUM,#00H	
	clr	p3.3

MAIN_LOOP:
	jb	p2.7,KEY_2
	call	DELAY
	call	MUN_ADD
	jmp	NEXT_LOOP

KEY_2:
	jb	p2.6,NEXT_LOOP
	call	DELAY
	call	MUN_SUB
	
NEXT_LOOP:
	call	DISPLAY_NUM
	jmp	MAIN_LOOP
	
	ret
;************************************************************
DISPLAY_NUM:
	mov	a,CURR_NUM
	mov	b,#0AH
	div	ab
	mov	R0,a

	mov	a,b
	mov	dptr,#TAB_LED
	movc	a,@a+dptr

	mov	p0,a
	mov	p2,#11111011B
	call	DELAY_DISP

	mov	a,R0
	mov	dptr,#TAB_LED
	movc	a,@a+dptr

	mov	p0,a
	mov	p2,#11110111B
	call	DELAY_DISP

	ret
;***********************************************************
MUN_ADD:
	mov	a,CURR_NUM
	cjne	a,#99,INC_NUM
	mov	CURR_NUM,#00H
	jmp	NUM_ADD_EXIT

INC_NUM:
	inc	CURR_NUM

NUM_ADD_EXIT:

	ret
;**************************************************************
MUN_SUB:
	mov	a,CURR_NUM
	jz	NUM_SUB_99

MUN_SUB_1:
	dec	CURR_NUM
	jmp	NUM_SUB_TEXT

NUM_SUB_99:
	mov	CURR_NUM,#99

NUM_SUB_TEXT:

	ret

;*************************************************************
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
;***********************************************************
	END