RTOD: 
MOV 	R5,#6 				
MOV 	R6,#0E5H
MOV 	R7,#2FH
DR: 							
MOV	A,@R0				
MOV	C,ACC.7
MOV	1FH,C
MOV	C,ACC.6
MOV	ACC.7,C
MOV	R2,A
INC		R0
MOV	A,@R0
MOV	R3,A
INC		R0
MOV	A,@R0
MOV	R4,A
DEC		R0
DEC		R0
CLR 	1EH 					
;通過乘法進行轉換
MUL1: 
MOV 	A,R3 				
ORL 	A,R4
JZ 		MUL6
MOV 	A,R6 				
ORL 	A,R7
JZ 		MUL5
MOV 	A,R7 				
MOV 	B,R4
MUL 	AB
MOV 	A,B
XCH 	A,R7
MOV 	B,R3
MUL 	AB
ADD 	A,R7
MOV 	R7,A
CLR 	A					
ADDC 	A,B
XCH 	A,R4
MOV 	B,R6
MUL 	AB
ADD 	A,R7
MOV 	R7,A
MOV 	A,B
ADDC 	A,R4
MOV 	R4,A
CLR 	A				
RLC 	A					
XCH 	A,R3
MOV	B,R6
MUL		AB
ADD 	A,R4
MOV 	R4,A
MOV 	A,B
ADDC 	A,R3
MOV 	R3,A
JB 		ACC.7,MUL2			
MOV 	A,R7 				
RLC 	A
MOV 	R7,A
LCALL 	RL1
MUL2: 
MOV 	A,R7
JNB 		ACC.7,MUL3
INC 		R4					
MOV 	A,R4
JNZ 		MUL3
INC 		R3
MOV 	A,R3
JNZ 		MUL3
MOV 	R3,#80H
INC 		R2
MUL3: 
MOV 	A,R2 				
ADD 	A,R5
MD: 
MOV 	R2,A 				
JB 		ACC.7,MUL4
JNB 		ACC.6,MUL6
MOV	R2,#3FH 				
SETB 	OV
RET
MUL4: 
JB 		ACC.6,MUL6
MUL5: 
CLR 	A 					
MOV 	R3,A
MOV 	R4,A
MOV 	R2,#41H
MUL6: 
CLR 	OV
RET
MOV0:						
INC		R0
INC		R0
MOV	A,R4
MOV	@R0,A
DEC		R0				
MOV	A,R3
MOV	@R0,A
DEC		R0					
MOV	A,R2
MOV	C,1FH
MOV	ACC.7,C
MOV	@R0,A
CLR		ACC.7
CLR		OV
CJNE	A,#3FH,MV01
SETB	OV
MV01:	
MOV	A,@R0
END