6.2.3单字节折半查找.txt

里面有好多的原码,大家都来下载.用asm编写的

SEARCHB:
MOV 	B,A						
MOV	A,R1
ADD		A,R7
MOV	R7,A
MOV	A,R0
ADDC	A,R6
MOV	R6,A
MOV	A,R7
SUBB	A,#01H
MOV	R7,A
JNC		SECH1					
DEC		R6						
SECH1:
MOV    	A,R7
CLR    	C
SUBB   	A,R1
MOV    	A,R6
SUBB   	A,R0
JNC    	SECH2					
MOV    	A,#0FFH
RET
SECH2:
MOV    	A,R7
ADD    	A,R1
MOV    	R2,A
MOV    	A,R6
ADDC   	A,R0
RRC    	A
MOV    	DPH,A
MOV    	A,R2
RRC    	A
MOV    	DPL,A
MOVX   	A,@DPTR					
CLR		C
SUBB	A,B
JNC		SECH3
INC		DPTR
MOV	R0,DPH					
MOV	R1,DPL					
SJMP	SECH1
SECH3:
JZ     	SECH5
MOV    	A,DPL
SUBB   	A,#01H
MOV    	R7,A
JNC    	SECH4
MOV    	R6,DPH
DEC    	R6						
SECH4:
SJMP   	SECH1
SECH5:
MOV    	R0,DPH
MOV    	R1,DPL
CLR    	A
RET