mc68ec040v Freescale Semiconductor, Inc, mc68ec040v Datasheet - Page 10

• Manufacturer Part Number: mc68ec040v
• Description: M68040 User Manual
• Manufacturer: Freescale Semiconductor, Inc

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