SH7261 datasheet(10/1348 Pages) RENESAS

10 / 1348 page

Rev. 2.00 Sep. 07, 2007 Page x of xxxii

Section 3 Floating-Point Unit (FPU)................................................................... 67

3.1

Features................................................................................................................................ 67

3.2

Data Formats........................................................................................................................ 67

3.2.1

Floating-Point Format............................................................................................. 67

3.2.2

Non-Numbers (NaN) .............................................................................................. 69

3.2.3

Denormalized Numbers .......................................................................................... 70

3.3

Register Descriptions ...........................................................................................................71

3.3.1

Floating-Point Registers ......................................................................................... 71

3.3.2

Floating-Point Status/Control Register (FPSCR) ................................................... 72

3.3.3

Floating-Point Communication Register (FPUL) ................................................... 73

3.4

Rounding.............................................................................................................................. 74

3.5

Floating-Point Exceptions.................................................................................................... 75

3.5.1

FPU Exception Sources .......................................................................................... 75

3.5.2

FPU Exception Handling ........................................................................................ 75

Section 4 Clock Pulse Generator (CPG) ............................................................. 77

4.1

Features................................................................................................................................ 77

4.2

Input/Output Pins................................................................................................................. 80

4.3

Clock Operating Modes ....................................................................................................... 81

4.4

Register Descriptions ...........................................................................................................87

4.4.1

Frequency Control Register (FRQCR) ................................................................... 87

4.4.2

CKIO Control Register (CKIOCR) ........................................................................ 90

4.5

Changing the Frequency ...................................................................................................... 91

4.5.1

Changing the Multiplication Rate ........................................................................... 91

4.5.2

Changing the Division Ratio................................................................................... 92

4.6

Notes on Board Design ........................................................................................................ 92

4.6.1

Note on Inputting External Clock ........................................................................... 92

4.6.2

Note on Using Crystal Resonator ........................................................................... 93

4.6.3

Note on Resonator .................................................................................................. 93

4.6.4

Note on Using a PLL Oscillation Circuit................................................................ 94

4.6.5

Note on Changing the Multiplication Rate ............................................................. 94

Section 5 Exception Handling ............................................................................. 95

5.1

Overview.............................................................................................................................. 95

5.1.1

Types of Exception Handling and Priority ............................................................. 95

5.1.2

Exception Handling Operations.............................................................................. 97

5.1.3

Exception Handling Vector Table .......................................................................... 99

5.2

Resets................................................................................................................................. 101

5.2.1

Input/Output Pins.................................................................................................. 101

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