MCS-51单片机应用开发实用子程序

				FDS1: 
				MOV 	B,A 					
				MOV 	R2,#0 				
				MOV 	A,R7 				 
				MOV 	R6,A 
				FD11: 
				MOV 	A,R2 			
				MOVC 	A,@A+DPTR 
				CJNE 	A,B,FD12				
				CLR 	OV 					
				MOV 	A,R2 				
				RET 
				FD12: 
				INC 		R2 					
				DJNZ 	R6,FD11 			
				SETB 	OV 					
				RET