MC68040RC25V datasheet(10/442 Pages) MOTOROLA

tên linh kiện	MC68040RC25V

Giải thích chi tiết về linh kiện	M68000-compatible, high-performance, 32-bit microprocessors

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nhà sản xuất	MOTOROLA [Motorola, Inc]

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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.

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Go to: www.freescale.com

Số phần tương tự - MC68040RC25V

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Freescale Semiconductor...	MC68040RC25V	3Mb / 442P	M68040 Users Manual

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