5.3.6 32位整数转换为4字节规格化浮点数.txt

《MCS-51单片机应用开发实用子程序》配套源代码下载

DIV16F:
ACALL 	DIV16L				
PUSH 	7
PUSH 	6
MOV  	R7,#0
MOV  	R6,#0
ACALL 	DIV16L
MOV 	3,R7
MOV 	7,R6
POP 		5
POP 		6					
MOV 	R4,#90H
MOV 	R2,#32
DIV16L:
MOV 	A,R5
JB 		ACC.7,NMLDN
MOV 	A,R3
ADD 	A,R3
MOV 	R3,A
LCALL 	H0					
DEC 	R4
DJNZ 	R2,DIV16L
MOV 	R4,#0
RET
NMLDN:
MOV 	A,R3
JNB 		ACC.7,DIVRT
LCALL 	INC3
MOV 	A,R5
JNZ 		DIVRT
INC 		R4
DIVRT:
ANL 	5,#7FH				
RET
DIV24:
CLR 	A					
MOV	B,#24;计数器
LXP:
LCALL 	SHIF
XCH 	A,R4
RLC 	A
XCH 	A,R4
RLC 	A
JNC 		LXP1
ACALL	SUB2Y				
SJMP 	DIV0
LXP1:
ACALL 	SUB2Y
JNC  	DIV0					
XCH 	A,R4
ADD 	A,R3
XCH 	A,R4
ADDC 	A,R2					
SJMP 	DIV1
DIV0:
INC 		R7					
DIV1:
DJNZ 	B,LXP
XCH 	A,R4
CLR 	C
RLC 	A
XCH 	A,R4
RLC 	A
JC  		GIN
ACALL 	SUB2Y
JNC 		GIN
RET3:
MOV 	R4,#0
RET							
GINC:
MOV 	R0,#7				
INC3A:
INC 		@R0
CJNE 	@R0,#0,RET3
DEC 	R0
SJMP 	INC3A
SUB2Y:
CLR 	C					
XCH 	A,R4
SUBB 	A,R3
XCH 	A,R4
SUBB 	A,R2
RET