5.3.1二进制数左规.txt

MCS－51单片机应用开发实用子程序.rar

;1定点数规格化
FXDN:
LD 		2CH,#40A0H			
LOOP:
JBS 		2BH,7,LOOP1			
SHLL 	24H,#1
ADDC 	28H,28H
ADDC	2AH,2AH
DECB	2CH
DJNZ 	2DH,LOOP
CLR  	2CH;0
LOOP1:
RET

2定点数规格化实例

FLTRLN: 
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