MCS－51单片机应用开发实用子程序.rar

				FLTRRN: 
				MOV 	A,R3 
				ORL 	A,R4 			
				JNZ 	RLN1
				MOV 	R2,#0C1H			
				RET 
				RLN1: 
				MOV 	A,R3
				JB 		ACC.7,RLN2		
				CLR 	C 				
				LCALL 	RL1
				SJMP 	RLN 			
				RLN2: 
				CLR 	OV 				
				RET
				MOV 	A,R3 			
				RRC 	A 				
				MOV 	R3,A
				MOV 	A,R4
				RRC 	A
				MOV 	R4,A
				INC 		R2 				
				CLR 	OV 				
				CJNE 	R2,#40H,RR1E		
				MOV 	R2,#3FH 			
				SETB 	OV
				RR1E: 
				RET