13.1.2数据传输率发生.txt

51单片机实用子程序

INTSP:
MOV	TMOD,#21H				
MOV  	TH1,#0FDH				
INSP5:
MOV 	SCON,#50H				
INSP7:
MOV 	IE,#0B1H					
MOV  	IP,#10H					
SETB 	TR1						
MOV 	1AH,#60H					
MOV 	1BH,#0
MOV 	1CH,#70H					
MOV 	1DH,#0
RET
SPSEV:
PUSH 	ACC
PUSH  	B
PUSH  	PSW
PUSH  	DPH
PUSH  	DPL
SETB  	RS1
CLR   	RS0						
JNB 		TI,RCV
CLR 	TI
JBC 		64H,SPS10					
SPSV1:
MOV 	DPH,1CH
MOV 	DPL,1DH
MOVX 	A,@DPTR					
INC  	DPTR
MOV  	1CH,DPH
MOV  	1DH,DPL
SPSV2:
CJNE 	A,#0AH,SPS11
SETB  	64H						
SPS11:
MOV 	C,P
MOV  	ACC.7,C					
MOV  	SBUF,A
SJMP 	SPCOM
SPS10:
MOV 	61H,#40H					
SJMP  	SPCOM
RCV:
CLR 	R1
RECV:
MOV 	A,SBUF
JB  		P,X25
CLR 	ACC.7
SJMP 	X26
X25:
MOV 	A,#23H					
X26:
MOV 	DPH,1AH
MOV  	DPL,1BH
MOVX 	@DPTR,A					
INC  	DPTR
MOV  	1AH,DPH
MOV  	1BH,DPL
SPCOM:
POP 		DPL
POP 		DPH
POP 		PSW
POP		B
POP 		ACC
RET