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Page xii of xl R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
Section 3 Floating-Point Unit (FPU) ................................................................... 95
3.1 Features ............................................................................................................................... 95
3.2 Data Formats ....................................................................................................................... 96
3.2.1 Floating-Point Format ......................................................................................... 96
3.2.2 Non-Numbers (NaN) .......................................................................................... 99
3.2.3 Denormalized Numbers .................................................................................... 100
3.3 Register Descriptions ........................................................................................................ 101
3.3.1 Floating-Point Registers ................................................................................... 101
3.3.2 Floating-Point Status/Control Register (FPSCR) ............................................. 102
3.3.3 Floating-Point Communication Register (FPUL) ............................................. 104
3.4 Rounding .......................................................................................................................... 105
3.5 FPU Exceptions ................................................................................................................ 106
3.5.1 FPU Exception Sources .................................................................................... 106
3.5.2 FPU Exception Handling .................................................................................. 106
Section 4 Boot Mode ......................................................................................... 109
4.1 Features ............................................................................................................................. 109
4.2 Boot Mode and Pin Function Setting ................................................................................ 109
4.3 Operation .......................................................................................................................... 110
4.3.1 Boot Mode 0 ..................................................................................................... 110
4.3.2 Boot Modes 1 and 3 .......................................................................................... 110
4.3.3 Boot Mode 2 ..................................................................................................... 111
4.4 Notes ................................................................................................................................. 114
4.4.1 Boot Related Pins ............................................................................................. 114
Section 5 Clock Pulse Generator ....................................................................... 115
5.1 Features ............................................................................................................................. 115
5.2 Input/Output Pins .............................................................................................................. 118
5.3 Clock Operating Modes .................................................................................................... 119
5.4 Register Descriptions ........................................................................................................ 122
5.4.1 Frequency Control Register (FRQCR) ............................................................. 122
5.5 Changing the Frequency ................................................................................................... 125
5.5.1 Changing the Division Ratio ............................................................................. 125
5.6 Usage of the Clock Pins .................................................................................................... 126
5.6.1 In the Case of Inputting an External Clock ....................................................... 126
5.6.2 In the Case of Using a Crystal Resonator ......................................................... 127
5.6.3 In the Case of Not Using the Clock Pin ............................................................ 127
5.7 Oscillation Stabilizing Time ............................................................................................. 128
5.7.1 Oscillation Stabilizing Time of the On-chip Crystal Oscillator ........................ 128