SH7263 Datasheet, PDF (10/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 3 Floating-Point Unit (FPU)................................................................... 87
3.1 Features................................................................................................................................ 87
3.2 Data Formats........................................................................................................................ 88
3.2.1 Floating-Point Format............................................................................................. 88
3.2.2 Non-Numbers (NaN) .............................................................................................. 91
3.2.3 Denormalized Numbers .......................................................................................... 92
3.3 Register Descriptions........................................................................................................... 93
3.3.1 Floating-Point Registers ......................................................................................... 93
3.3.2 Floating-Point Status/Control Register (FPSCR) ................................................... 94
3.3.3 Floating-Point Communication Register (FPUL) ................................................... 95
3.4 Rounding.............................................................................................................................. 96
3.5 FPU Exceptions ................................................................................................................... 97
3.5.1 FPU Exception Sources .......................................................................................... 97
3.5.2 FPU Exception Handling ........................................................................................ 97
Section 4 Clock Pulse Generator (CPG) ............................................................. 99
4.1 Features................................................................................................................................ 99
4.2 Input/Output Pins............................................................................................................... 103
4.3 Clock Operating Modes ..................................................................................................... 104
4.4 Register Descriptions......................................................................................................... 109
4.4.1 Frequency Control Register (FRQCR) ................................................................. 109
4.5 Changing the Frequency .................................................................................................... 112
4.5.1 Changing the Multiplication Rate......................................................................... 112
4.5.2 Changing the Division Ratio................................................................................. 113
4.5.3 Note on Using a PLL Oscillation Circuit.............................................................. 114
4.6 Usage Note......................................................................................................................... 115
Section 5 Exception Handling ........................................................................... 117
5.1 Overview............................................................................................................................ 117
5.1.1 Types of Exception Handling and Priority ........................................................... 117
5.1.2 Exception Handling Operations............................................................................ 119
5.1.3 Exception Handling Vector Table ........................................................................ 121
5.2 Resets................................................................................................................................. 123
5.2.1 Input/Output Pins.................................................................................................. 123
5.2.2 Types of Reset ...................................................................................................... 123
5.2.3 Power-On Reset .................................................................................................... 124
5.2.4 Manual Reset ........................................................................................................ 126
5.3 Address Errors ................................................................................................................... 127
5.3.1 Address Error Sources .......................................................................................... 127
5.3.2 Address Error Exception Handling....................................................................... 128
Rev. 2.00 Mar. 14, 2008 Page x of xxxiv
REJ09B0290-0200