SH7261 Datasheet, PDF (10/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

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