7.2.5反正切函数

7.2.5反正切函数 FATN: MOV A,@R0 MOV C,ACC.7 MOV 1DH,C CLR ACC.7 MOV @R0,A CLR 1CH JB ACC.6,ATN1 JZ ATN1 SETB 1CH LCALL FRCP ATN1: FPLN: POP DPH POP DPL XCH A,R0 XCH A,R1 XCH A,R0 CLR A MOV R2,A MOV R3,A MOV R4,A CLR 1FH PLN1: CLR A MOVC A,@A+DPTR MOV C,ACC.7 MOV 1EH,C MOV C,ACC.6 MOV ACC.7,C MOV R5,A INC DPTR CLR A MOVC A,@A+DPTR MOV R6,A INC DPTR CLR A MOVC A,@A+DPTR MOV R7,A INC DPTR MOV C,1EH RRC A XRL A,23H RLC A MOV F0,C AS1: MOV A,R6 ORL A,R7 JZ AS2 MOV A,R3 ORL A,R4 JNZ EQ1 MOV A,R6 MOV R3,A MOV A,R7 MOV R4,A MOV A,R5 MOV R2,A MOV C,1EH MOV 1FH,C CLR A MOVC A,@A+DPTR CJNE A,#40H,PLN2 XCH A,R0 XCH A,R1 XCH A,R0 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 CLR A INC DPTR JMP @A+DPTR PLN2: MOV A,@R1 XRL A,23H RLC A MOV 1FH,C LCALL MUL0 SJMP PLN1 FLOG: 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 JB 1FH,LNOV MOV A,R3 ORL A,R4 JNZ LN0 LNOV: SETB OV JNB OV,LOG RET MUL0: LCALL MVR1 MUL1: MOV A,R3 ORL A,R4 JZ MUL6 MOV A,R6 ORL A,R7 JZ MUL5 MOV A,R7 MOV B,R4 MUL AB MOV A,B XCH A,R7 MOV B,R3 MUL AB ADD A,R7 MOV R7,A CLR A ADDC A,B XCH A,R4 MOV B,R6 MUL AB ADD A,R7 MOV R7,A MOV A,B ADDC A,R4 MOV R4,A CLR A RLC A XCH A,R3 MOV B,R6 MUL AB ADD A,R4 MOV R4,A MOV A,B ADDC A,R3 MOV R3,A JB ACC.7,MUL2 MOV A,R7 RLC A MOV R7,A LCALL RL1 MUL2: MOV A,R7 JNB ACC.7,MUL3 INC R4 MOV A,R4 JNZ MUL3 INC R3 MOV A,R3 JNZ MUL3 MOV R3,#80H INC R2 MUL3: MOV A,R2 ADD A,R5 MD: MOV R2,A JB ACC.7,MUL4 JNB ACC.6,MUL6 MOV R2,#3FH SETB OV RET MUL4: JB ACC.6,MUL6 MUL5: CLR A MOV R3,A MOV R4,A MOV R2,#41H MUL6: CLR OV RET DB 0FCH,0E4H,91H DB 7FH,8FH,37H DB 0FFH,0EDH,0E0H DB 7BH,0E8H,77H DB 0,0FFH,68H DB 72H,85H,0ECH DB 40H JNB 1CH,ATN2 CPL 1FH MOV C,1FH MOV F0,C MOV R5,#1 MOV R6,#0C9H MOV R7,#10H LCALL AS1 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 CLR A INC DPTR JMP @A+DPTR RET