m68hc08浮点运算子程序.mht

MC系列单片机浮点运算子程序

<P>* Entry: An,...,A1,A0 in ROM Location after *</P>
<P>* JSR FPLN instruction, Ended with $FF *</P>
<P>* X in Stack *</P>
<P>* Exit: Y in Stack *</P>
<P>***************************************************</P>
<P>FPLN: TSX</P>
<P>LDA ,X</P>
<P>PSHA</P>
<P>LDX 1,X</P>
<P>PULH ;(HX)=3DAn's Address</P>
<P>LDA 3,X ;Y=3DAn</P>
<P>PSHA</P>
<P>LDA 2,X</P>
<P>PSHA</P>
<P>LDA 1,X</P>
<P>PSHA</P>
<P>LDA ,X</P>
<P>PSHA</P>
<P>AIX #4</P>
<P>STX 5,SP</P>
<P>PSHH</P>
<P>PULA</P>
<P>STA 6,SP</P>
<P>FPLN1: LDA 10,SP ;X</P>
<P>PSHA</P>
<P>LDA 10,SP</P>
<P>PSHA</P>
<P>LDA 10,SP</P>
<P>PSHA</P>
<P>LDA 10,SP</P>
<P>PSHA</P>
<P>JSR FMUL ;Y*X-&gt;Y</P>
<P>LDA 6,SP</P>
<P>PSHA</P>
<P>PULH</P>
<P>LDX 5,SP</P>
<P>LDA 3,X ;Ai</P>
<P>PSHA</P>
<P>LDA 2,X</P>
<P>PSHA</P>
<P>LDA 1,X</P>
<P>PSHA</P>
<P>LDA ,X</P>
<P>PSHA</P>
<P>JSR FADD ;Y+Ai-&gt;Y</P>
<P>LDA 6,SP</P>
<P>PSHA</P>
<P>PULH</P>
<P>LDX 5,SP</P>
<P>AIX #4</P>
<P>STX 5,SP</P>
<P>PSHH</P>
<P>PULA</P>
<P>STA 6,SP</P>
<P>LDA ,X</P>
<P>CMP #$FF</P>
<P>BNE FPLN1</P>
<P>FPLNE: LDA 1,SP</P>
<P>STA 7,SP</P>
<P>LDA 2,SP</P>
<P>STA 8,SP</P>
<P>LDA 3,SP</P>
<P>STA 9,SP</P>
<P>LDA 4,SP</P>
<P>STA 10,SP</P>
<P>AIX #1</P>
<P>AIS #6</P>
<P>JMP ,X ;Return</P></FONT><FONT size=3D5>
<P>2. </FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN =
size=3D5>=B8=A1=B5=E3=BF=AA=C6=BD=B7=BD=D7=D3=B3=CC=D0=F2=A3=BA</FONT><FO=
NT=20
size=3D5>FSQR</P></FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>
<P>=A2=D9=B9=A6=C4=DC=A3=BA=BC=C6=CB=E3</FONT> Y <FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=BD</FONT> SQR(X)<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A1=A3</P>
<P>=C8=EB=BF=DA=A3=BA</FONT>X<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D4=DA=B6=D1=D5=BB=D6=D0=A1=A3</P>
<P>=B3=F6=BF=DA=A3=BA</FONT>C<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=BD</FONT>1<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=AC=B3=F6=B4=ED=A3=A8=B8=BA=CA=FD=BF=AA=C6=BD=B7=BD=A3=A9=
=A3=BB</FONT>C<FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=BD</FONT>0<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=AC=D5=FD=B3=A3=A3=AC</FONT>Y<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D4=DA=B6=D1=D5=BB=D6=D0=A1=A3</P>
<P>=CB=FC=D0=E8=CA=B9=D3=C3</FONT>23<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D7=D6=BD=DA=B6=D1=D5=BB=C7=F8=A3=A8=BA=AC</FONT>4<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=D7=D6=BD=DA=B8=A1=B5=E3=CA=FD</FONT>X<FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=AC</FONT>2<FONT face=3D=CB=CE=CC=E5 =

lang=3DZH-CN>=D7=D6=BD=DA=B5=F7=D3=C3=D6=B8=C1=EE=B5=C4=B7=B5=BB=D8=B5=D8=
=D6=B7=A3=A9=A1=A3</P>
<P>=D6=B4=D0=D0=CA=B1=BC=E4=D4=BC</FONT>1000<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=AD</FONT>2000<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A6=CC</FONT>s<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=A8=D3=EB=CA=FD=BE=DD=D3=D0=B9=D8=A3=A9=A1=A3</P>
<P>=A2=DA=CB=E3=B7=A8=A3=BA</P>
<P>=B2=C9=D3=C3=C5=A3=B6=D9=B5=FC=B4=FA=B7=A8=A3=AC=B6=D4</FONT>Y<FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=BD</FONT>SQR(X)<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=AC=C8=E7=CF=C2=BC=C6=CB=E3=A3=BA</P>
<P></FONT>1) X<FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=AD</FONT>&gt; =
Z<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A1=A3</P>
<P></FONT>2) ( Z + X/Z ) / 2 -&gt; Y<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A1=A3</P>
<P></FONT>3) <FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=C8=E7=A3=FC</FONT>Z<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=AD</FONT>Y<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=FC</FONT>&lt; 0.000001<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=CD=CB=B3=F6=A3=BB=B7=F1=D4=F2</FONT>Y -&gt; Z<FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=AC=D7=AA</FONT>2)<FONT=20
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A1=A3</P>
<P></FONT>4) <FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=B0=D1=B8=A1=B5=E3=CA=FD=CE=B2=CA=FD=D7=AA=BB=BB=B3=C9=CA=AE=
=BD=F8=D6=C6=D0=A1=CA=FD=A3=A8=B5=A5=D7=D6=BD=DA</FONT>BCD<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=C2=EB=B8=F1=CA=BD=A3=A9=A1=A3</P>
<P>=A2=DB=C0=FD=A3=BA</P>
<P>=C8=EB=BF=DA=CA=B1</FONT> X<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=BD</FONT>2 ($40,$00,$00,$00)<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=AC=B3=F6=BF=DA=CA=B1=A3=AC</FONT>Y =3D 1.414213538 =
($3F,$B5,$04,$F3)<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A1=A3</P>
<P>=CE=F3=B2=EE=A3=BA</FONT>0.000000024.</P>
<P><FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A2=DC=B3=CC=D0=F2=A3=BA</P></FONT><FONT size=3D1>
<P>***************************************************</P>
<P>* FSQR: Square Root Subroutine Y =3D SQR(X) *</P>
<P>* Entry: X in Stack *</P>
<P>* Exit: CY =3D 1, Error; =3D 0 Normal *</P>
<P>* Y in Stack *</P>
<P>***************************************************</P>
<P>FSQR: LDA 3,SP ;SQR(X)-&gt;Y</P>
<P>BPL FSQR1</P>
<P>SEC</P>
<P>RTS</P>
<P>FSQR1: BNE FSQR2</P>
<P>CLC</P>
<P>RTS</P>
<P>FSQR2: AIS #-4 ;X-&gt;Yi</P>
<P>PSHA</P>
<P>LDA 10,SP</P>
<P>PSHA</P>
<P>LDA 10,SP</P>
<P>PSHA</P>
<P>LDA 10,SP</P>
<P>PSHA</P>
<P>FSQR3: LDA 1,SP ;Yi-&gt;Y</P>
<P>STA 5,SP</P>
<P>LDA 2,SP</P>
<P>STA 6,SP</P>
<P>LDA 3,SP</P>
<P>STA 7,SP</P>
<P>LDA 4,SP</P>
<P>STA 8,SP</P>
<P>LDA 14,SP ;X</P>
<P>PSHA</P>
<P>LDA 14,SP</P>
<P>PSHA</P>
<P>LDA 14,SP</P>
<P>PSHA</P>
<P>LDA 14,SP</P>
<P>PSHA</P>
<P>JSR FDIV ;X/Yi</P>
<P>LDA 8,SP ;Yi</P>
<P>PSHA</P>
<P>LDA 8,SP</P>
<P>PSHA</P>
<P>LDA 8,SP</P>
<P>PSHA</P>
<P>LDA 8,SP</P>
<P>PSHA</P>
<P>JSR FADD ;+Yi-&gt;Y</P>
<P>LDA 1,SP</P>
<P>LSL 2,SP</P>
<P>ROLA</P>
<P>DECA ;Y/2-&gt;Yi+1</P>
<P>PSHA</P>
<P>RORA</P>
<P>ROR 3,SP</P>
<P>STA 2,SP</P>
<P>LDA 6,SP</P>
<P>LDX 7,SP</P>
<P>LSLX</P>
<P>ROLA</P>
<P>CMP 1,SP</P>
<P>BNE FSQR4</P>
<P>PULX</P>
<P>LDA 4,SP</P>
<P>SUB 8,SP</P>
<P>PSHA</P>
<P>LDA 4,SP</P>
<P>SBC 8,SP</P>
<P>BNE FSQR4</P>
<P>LDA 3,SP</P>
<P>SBC 7,SP</P>
<P>BNE FSQR4</P>
<P>PULA</P>
<P>AND #$F0</P>
<P>BNE FSQR3</P>
<P>LDA 1,SP</P>
<P>STA 11,SP</P>
<P>LDA 2,SP</P>
<P>STA 12,SP</P>
<P>LDA 3,SP</P>
<P>STA 13,SP</P>
<P>LDA 4,SP</P>
<P>STA 14,SP</P>
<P>AIS #8</P>
<P>CLC</P>
<P>RTS</P>
<P>FSQR4: PULA</P>
<P>JMP FSQR3</P>
<P>=A1=A1</P>
<P>=A1=A1</P></FONT><FONT size=3D4>
<P>3. </FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN =
size=3D4>=D6=B8=CA=FD=BA=AF=CA=FD=D7=D3=B3=CC=D0=F2=A3=BA</FONT><FONT=20
size=3D4>FEXP</P></FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>
<P>=A2=D9=B9=A6=C4=DC=A3=BA=BC=C6=CB=E3</FONT> Y <FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=BD</FONT> EXP(X)<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=BD</FONT>E<SUP>X</SUP><FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A1=A3</P>
<P>=C8=EB=BF=DA=A3=BA</FONT>X<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D4=DA=B6=D1=D5=BB=D6=D0=A1=A3</P>
<P>=B3=F6=BF=DA=A3=BA</FONT>Y<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D4=DA=B6=D1=D5=BB=D6=D0=A1=A3</P>
<P>=CB=FC=D0=E8=CA=B9=D3=C3</FONT>25<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D7=D6=BD=DA=B6=D1=D5=BB=C7=F8=A3=A8=BA=AC</FONT>4<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=D7=D6=BD=DA=B8=A1=B5=E3=CA=FD</FONT>X<FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=AC</FONT>2<FONT face=3D=CB=CE=CC=E5 =

lang=3DZH-CN>=D7=D6=BD=DA=B5=F7=D3=C3=D6=B8=C1=EE=B5=C4=B7=B5=BB=D8=B5=D8=
=D6=B7=A3=A9=A1=A3</P>
<P>=D6=B4=D0=D0=CA=B1=BC=E4=D4=BC</FONT>770<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A6=CC</FONT>s<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A1=A3</P>
<P>=A2=DA=CB=E3=B7=A8=A3=BA</P>
<P>=B2=C9=D3=C3=D6=B8=CA=FD=B1=E4=BB=BB=B7=A8=BA=CD=C7=D0=B1=C8=D1=A9=B7=F2=
=B2=E5=D6=B5=B7=A8=BC=C6=CB=E3=A1=A3=CF=C8=BC=C6=CB=E3</FONT>X<FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A1=C1</FONT>( 1/ln2)<FONT=20
face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=AC=C8=A1=CB=FC=B5=C4=D5=FB=CA=FD=B2=BF=B7=D6=CE=AA</FONT=
>m<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=AC=D0=A1=CA=FD=B2=BF=B7=D6=CE=AA</FONT>t<FONT=20
face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=AC=D4=D9=D3=C3=CF=C2=CA=BD=BC=C6=CB=E3</FONT>2<SUP>t</SU=
P><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=BA</P>
<P></FONT>Z =3D 2<SUP>t </SUP>=3D 0.0000159268622*t<SUP>7</SUP> +=20
0.00075674366*t<SUP>6</SUP> + 0.00133248629*t<SUP>5</SUP> +=20
0.0096164148*t<SUP>4</SUP> + 0.05550444*t<SUP>3 </SUP>+=20
0.240220823*t<SUP>2</SUP> + 0.69314744*t + 0.99999999</P>
<P><FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=D7=EE=BA=F3=BC=C6=CB=E3</FONT> E<SUP>X</SUP><FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A3=BD</FONT>2<SUP>log2EX</SUP> =3D 2 <SUP>X*(1/ln2)</SUP> =
=3D 2<SUP>=20
m+t</SUP> =3D 2<SUP>m</SUP> * 2<SUP>t</SUP> =3D 2<SUP>m</SUP> * Z =3D 2 =
<SUP>m</SUP> *=20
2<SUP>Z<FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>=BD=D7</FONT></SUP>*Z<FONT =
face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=CE=B2</FONT> =3D 2<SUP> m+Z<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=BD=D7</FONT></SUP> * Z<FONT=20
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=CE=B2</FONT> =3D Y</P>
<P><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A2=DB=C0=FD=A3=BA</P>
<P>=C8=EB=BF=DA=CA=B1</FONT> X<FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A3=BD</FONT>1.5 ($3F,$C0,$00,$00)<FONT=20
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=AC=B3=F6=BF=DA=CA=B1=A3=AC</FONT>Y =
=3D 4.481688499 ($40,$8F,$69,$FE)<FONT face=3D=CB=CE=CC=E5=20
lang=3DZH-CN>=A1=A3</P>
<P>=CE=F3=B2=EE=A3=BA</FONT>-0.00000057.</P>
<P><FONT face=3D=CB=CE=CC=E5 =
lang=3DZH-CN>=A2=DC=B3=CC=D0=F2=A3=BA</P></FONT><FONT size=3D1>
<P>***************************************************</P>
<P>* FEXP: Exponent Function Subroutine *</P>
<P>* Y =3D EXP(X) ( E^X ) *</P>
<P>* Entry: X in Stack *</P>
<P>* Exit: Y in Stack *</P>
<P>***************************************************</P>
<P>FEXP: LDA 6,SP</P>
<P>PSHA ;X-&gt;X</P>
<P>LDA 6,SP</P>
<P>PSHA</P>
<P>LDA 6,SP</P>
<P>PSHA</P>
<P>LDA 6,SP</P>
<P>PSHA</P>
<P>LDA #$3F ;1/ln2=3D1.442695041</P>
<P>PSHA</P>
<P>LDA #$B8</P>
<P>PSHA</P>
<P>LDA #$AA</P>
<P>PSHA</P>
<P>LDA #$3B</P>
<P>PSHA</P>
<P>JSR FMUL ;X*1/ln2-&gt;Y</P>
<P>LDA 1,SP</P>
<P>PSHA</P>
<P>AIS #-3</P>
<P>PSHA</P>
<P>LDA 7,SP</P>
<P>STA 6,SP</P>
<P>STA 2,SP</P>
<P>LDA 8,SP</P>
<P>STA 7,SP</P>
<P>STA 3,SP</P>
<P>LDX 9,SP ; b7=3DSign</P>
<P>STX 8,SP</P>
<P>STX 4,SP</P>
<P>LSLA</P>
<P>ROLX</P>
<P>CPX #$7F</P>
<P>BHS FEXP0</P>
<P>CLR 9,SP</P>
<P>AIS #4</P>
<P>BRA FEXP4</P>
<P>FEXP0: CPX #$86</P>
<P>BHS FEXP5</P>
<P>SEC</P>
<P>RORA</P>
<P>FEXP1: LSRA</P>
<P>INCX</P>
<P>CPX #$86</P>
<P>BNE FEXP1</P>
<P>PSHA</P>
<P>TST 10,SP</P>
<P>BPL FEXPX</P>
<P>NEGA</P>
<P>FEXPX: STA 10,SP ;m</P>
<P>PULA</P>
<P>FEXP2: BIT #$80</P>
<P>BNE FEXP3</P>
<P>LSLA</P>
<P>DECX</P>
<P>BRA FEXP2</P>
<P>FEXP3: CLR 5,SP</P>
<P>CLR 6,SP</P>
<P>LSLA</P>
<P>STA 7,SP</P>
<P>LDA 4,SP</P>
<P>LSLA</P>
<P>RORX</P>
<P>ROR 7,SP</P>
<P>STX 8,SP ;M</P>
<P>JSR FSUB ;Y-M-&gt;Y</P>
<P>FEXP4: JSR FPLN</P>
<P>FCB $37,$85,$9A,$AD ;0.0000159268622</P>
<P>FCB $39,$24,$5B,$8F ;0.000156743669</P>
<P>FCB $3A,$AE,$A6,$D2 ;0.00133248629</P>
<P>FCB $3C,$1D,$8E,$2B ;0.0096164148</P>
<P>FCB $3D,$63,$58,$A0 ;0.05550444</P>
<P>FCB $3E,$75,$FE,$06 ;0.240226833</P>
<P>FCB $3F,$31,$72,$17 ;0.693147144</P>
<P>FCB $3F,$7F,$FF,$FF ;0.99999999</P>
<P>FCB $FF</P>
<P>LDA 4,SP</P>
<P>LDX 3,SP</P>
<P>LSLX</P>
<P>ROLA</P>
<P>ADD 5,SP</P>
<P>LSRA</P>
<P>STA 11,SP</P>
<P>RORX</P>
<P>STX 10,SP</P>
<P>LDA 2,SP</P>
<P>STA 9,SP</P>
<P>LDA 1,SP</P>
<P>STA 8,SP</P>
<P>AIS #5</P>
<P>RTS</P>
<P>FEXP5: AIS #9</P>
<P>LDA 6,SP</P>
<P>BPL FEXP6</P>
<P>CLR 6,SP ; 0 -&gt; Y</P>
<P>CLR 5,SP</P>
<P>CLR 4,SP</P>
<P>CLR 3,SP</P>
<P>RTS</P>
<P>FEXP6: LDA #$FF ; Over Flow</P>
<P>STA 6,SP</P>
<P>STA 5,SP</P>
<P>STA 4,SP</P>
<P>STA 3,SP</P>
<P>RTS</P></FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>
<P>=A1=A1</P></FONT><FONT size=3D4>
<P>4. </FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN =
size=3D4>=D7=D4=C8=BB=B6=D4=CA=FD=D7=D3=B3=CC=D0=F2=A3=BA</FONT><FONT=20
size=3D4>FLNX</P></FONT><FONT face=3D=CB=CE=CC=E5 lang=3DZH-CN>
<P>=A2=D9=B9=A6=C4=DC=A3=BA=BC=C6=CB=E3</FONT> Y <FONT =
face=3D=CB=CE=CC=E5 lang=3DZH-CN>=A3=BD</FONT> ln X<FONT =
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