7.2.2浮点余弦函数.txt

来自「《MCS-51单片机应用开发实用子程序》配套源代码」· 文本 代码 · 共 101 行

FLTCOS: 
LCALL 	FABS 			
MOV 	R5,#1 				
MOV 	R6,#0C9H
MOV 	R7,#10H
CLR 	1EH					
MOV	A,@R0
MOV	C,ACC.7
MOV	1FH,C
MOV	C,ACC.6
MOV	ACC.7,C
MOV	R2,A
INC		R0
MOV	A,@R0
MOV	R3,A
INC		R0				
MOV	A,@R0
MOV	R4,A
DEC		R0				
DEC		R0
CLR 	F0
FPLN1: 						
SETB 	7CH					
ACALL 	LD4				
ACALL 	LD0
ACALL 	FPMU				
SJMP  	FLN0
FPLN2:
CLR 	7CH					
FLN0:
ACALL 	LD1					
POP 		DPH
POP 		DPL
CLR 	A
MOVC 	A,@A+DPTR
MOV  	R0,A
INC  	DPTR
CLR  	A 					
MOVC 	A,@A+DPTR
MOV  	R1,A
INC  	DPTR
CLR  	A
MOVC 	A,@A+DPTR
MOV  	R2,A
INC  	DPTR
CLR  	A
MOVC 	A,@A+DPTR
MOV  	R3,A;取an
INC  	DPTR
PLN:
ACALL 	M1					
CLR  	A
MOVC 	A,@A+DPTR
MOV  	R0,A
INC  	DPTR
CLR  	A
MOVC 	A,@A+DPTR
MOV  	R1,A
INC  	DPTR
CLR  	A
MOVC 	A,@A+DPTR
MOV  	R2,A
INC  	DPTR
CLR  	A
MOVC	A,@A+DPTR
MOV  	R3,A;取ai-1
INC  	DPTR
ACALL 	FPLAD			
CLR  	A
MOVC 	A,@A+DPTR
ACALL 	GET1
DEC  	A
JNZ  	PLN					
PEND:
JNB 		7CH,REND
ACALL 	GET4
ACALL 	M1					
REND:
MOV 	A,#1
;保存结果,接着运行下面的FSIN程序
MOV0:	
INC		R0
INC		R0
MOV	A,R4
MOV	@R0,A
DEC		R0				
MOV	A,R3
MOV	@R0,A
DEC		R0
MOV	A,R2
MOV	C,1FH
MOV	ACC.7,C
MOV	@R0,A
CLR		ACC.7
CLR		OV					
CJNE	A,#3FH,MV01
SETB	OV
MV01:	
MOV	A,@R0
RET