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MC68040FE33V Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC68040FE33V Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 442 page  xii M68040 USER’S MANUAL MOTOROLA TABLE OF CONTENTS (Continued) Paragraph Page Number Title Number 8.4.6.5 Write-Back Address and Write-Back Data ..................................... 8-26 8.4.6.6 Push Data ...................................................................................... 8-27 8.4.6.7 Access Error Stack Frame Return From Exception ....................... 8-27 Section 9 Floating-Point Unit (MC68040 Only) 9.1 Floating-Point Unit Pipeline ...................................................................9-1 9.2 Floating-Point User Programming Model .............................................. 9-2 9.2.1 Floating-Point Data Registers (FP7–FP0) ......................................... 9-2 9.2.2 Floating-Point Control Register (FPCR) ............................................ 9-3 9.2.2.1 Exception Enable Byte ...................................................................9-3 9.2.2.2 Mode Control Byte ......................................................................... 9-3 9.2.3 Floating-Point Status Register (FPSR) ..............................................9-4 9.2.3.1 Floating-Point Condition Code Byte............................................... 9-4 9.2.3.2 Quotient Byte ................................................................................. 9-5 9.2.3.3 Exception Status Byte.................................................................... 9-5 9.2.3.4 Accrued Exception (AEXC) Byte. .................................................. 9-5 9.2.4 Floating-Point Instruction Address Register (FPIAR) ........................ 9-6 9.3 Floating-Point Data Formats and Data Types....................................... 9-7 9.4 Computational Accuracy ....................................................................... 9-11 9.4.1 Intermediate Result ........................................................................... 9-12 9.4.2 Rounding the Result .......................................................................... 9-13 9.5 Postprocessing Operation..................................................................... 9-15 9.5.1 Underflow, Round, Overflow ............................................................. 9-16 9.5.2 Conditional Testing ............................................................................9-16 9.6 Floating-Point Exceptions ..................................................................... 9-20 9.6.1 Unimplemented Floating-Point Instructions....................................... 9-20 9.6.2 Unsupported Floating-Point Data Types ...........................................9-22 9.7 Floating-Point Arithmetic Exceptions ....................................................9-24 9.7.1 Branch/Set on Unordered (BSUN) ....................................................9-25 9.7.1.1 Maskable Exception Conditions..................................................... 9-26 9.7.1.2 Nonmaskable Exception Conditions .............................................. 9-27 9.7.2 Signaling Not-a-Number (SNAN)....................................................... 9-27 9.7.2.1 Maskable Exception Conditions..................................................... 9-27 9.7.2.2 Nonmaskable Exception Conditions .............................................. 9-27 9.7.3 Operand Error ................................................................................... 9-28 9.7.3.1 Maskable Exception Conditions..................................................... 9-29 9.7.3.2 Nonmaskable Exception Conditions .............................................. 9-30 9.7.4 Overflow ............................................................................................ 9-31 9.7.4.1 Maskable Exception Conditions..................................................... 9-31 9.7.4.2 Nonmaskable Exception Conditions .............................................. 9-31 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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