congji.asm

单片机串行通讯从机程序

	ORG	0000H
	AJMP	MAIN
	ORG	0023H
	AJMP	CHX
	ORG	0100H
MAIN:	MOV	SP,#60H                      指针加大
	MOV	SCON,#90H                    方式2允许接收
	MOV	PCON,#80H                    拨特率187.5*2
	MOV	20H,#0AH                     
	MOV	21H,#00
	
	MOV	5DH,#00
	MOV	5EH,#00
	MOV	5FH,#00
	SETB	EA
	SETB	ES                            开串行口中断
XSH:	MOV	A,5DH
	MOV	B,#0AH
	DIV	AB
	SWAP	A
	ORL	A,B
	MOV	5AH,A
	MOV	A,5EH
	MOV	B,#0AH
	DIV	AB
	SWAP	A
	ORL	A,B
	MOV	5BH,A
	MOV	A,5FH
	MOV	B,#0AH
	DIV	AB
	SWAP	A
	ORL	A,B
	MOV	5CH,A
	MOV	DPTR,#2100H
	MOV	A,#0EH
	MOVX	@DPTR,A
	ACALL	FB
	ACALL	DIR
	AJMP	XSH
	
	ORG	0200H                                  分半子程序
FB:	MOV	R0,#5CH
	MOV	R1,#79H
	MOV	R3,#03H
LP2:	MOV	A,@R0
	MOV	R2,A
	SWAP	A
	ANL	A,#0FH
	MOV	@R1,A
	INC     R1
	MOV 	A,R2
	ANL	A,#0FH
	MOV	@R1,A
	INC	R1
	DEC	R0
	DJNZ	R3,LP2
	RET
	
	ORG	0300H                    显示子程序
DIR:	MOV	R0,#79H
	MOV	R2,#01H
	MOV	A,R2
LD0:	MOV	DPTR,#2103H
	MOVX	@DPTR,A
	MOV	DPTR,#2102H
	MOV	A,@R0
	ADD	A,#0FH
	MOVC	A,@A+PC
DIR1:	MOVX	@DPTR,A
	MOV	R7,#02H
	ACALL	DL
	INC	R0
	MOV	A,R2
	JB	ACC.5,LD1
	RL	A
	MOV	R2,A
	AJMP	LD0
LD1:	RET
DSEG0:	DB	3FH,06H,5BH,4FH,66H,6DH
DSEG1:	DB	7DH,07H,7FH,6FH,77H,7CH
DSEG2:	DB	39H,5EH,79H,71H,73H,21H
DSEG3:	DB	31H,6EH,40H,3EH,00H,00H
DL:	MOV	R6,#0FFH
DL6:	DJNZ	R6,DL6
	DJNZ	R7,DL
	RET
	
  	
	ORG	0400H                    
CHX:	PUSH	ACC
	PUSH	PSW
	CLR	RI
	INC	21H
	MOV	A,21H
	CJNE	A,#01H,NEXT1
	MOV	A,SBUF
	MOV	5DH,A
	SJMP	NEXT
NEXT1:	CJNE	A,#02H,NEXT2
	MOV	A,SBUF
	MOV	5EH,A
	SJMP	NEXT
NEXT2:	CJNE	A,#03H,NEXT3
	MOV	A,SBUF
	MOV	5FH,A
	SJMP	NEXT
NEXT3:	MOV	21H,#00
NEXT:	POP	PSW
	POP	ACC
	RETI
	END