CRCST:
MOV 	R1,#0				
MOV 	R2,#0
MOV 	R3,#2
MOV 	R4,#144				
MOV	DPTR,#DTPINT			
CRC1:
MOV 	R5,#8				
MOVX  	A,@DPTR
INC   	DPTR
CRC2:
CLR 	C					
RLC  	A
XCH  	A,R2					
RLC  	A
XCH  	A,R2
XCH  	A,R1
RLC  	A
XCH  	A,R1					
JNC  	CRC3
XRL  	1,#80H				
XRL  	2,#05
CRC3:
DJNZ 	R5,CRC2				
DJNZ 	R4,CRC1				
DJNZ 	R3,CRC1
LCALL 	DECD				
MOV  	A,R1
MOVX	 @DPTR,A
INC  	DPTR
MOV  	A,R2
MOVX 	@DPTR,A				
RET