Renesas SH7781 Manual do Utilizador descarregar pdf (Página 10)

Rev.1.00 Jan. 10, 2008 Page x of xxx

REJ09B0261-0100

5.2.2 Exception Event Register (EXPEVT)................................................................... 91

5.2.3 Interrupt Event Register (INTEVT)...................................................................... 92

5.2.4 Non-Support Detection Exception Register (EXPMASK)................................... 93

5.3 Exception Handling Functions............................................................................................. 95

5.3.1 Exception Handling Flow ..................................................................................... 95

5.3.2 Exception Handling Vector Addresses ................................................................. 95

5.4 Exception Types and Priorities ............................................................................................ 96

5.5 Exception Flow.................................................................................................................... 98

5.5.1 Exception Flow..................................................................................................... 98

5.5.2 Exception Source Acceptance ............................................................................ 100

5.5.3 Exception Requests and BL Bit.......................................................................... 101

5.5.4 Return from Exception Handling........................................................................ 101

5.6 Description of Exceptions.................................................................................................. 102

5.6.1 Resets.................................................................................................................. 102

5.6.2 General Exceptions............................................................................................. 104

5.6.3 Interrupts............................................................................................................. 120

5.6.4 Priority Order with Multiple Exceptions ............................................................ 121

5.7 Usage Notes ....................................................................................................................... 123

Section 6 Floating-Point Unit (FPU) .............................................................................. 125

6.1

Features.............................................................................................................................. 125

6.2 Data Formats...................................................................................................................... 126

6.2.1 Floating-Point Format......................................................................................... 126

6.2.2 Non-Numbers (NaN) .......................................................................................... 129

6.2.3 Denormalized Numbers...................................................................................... 130

6.3 Register Descriptions......................................................................................................... 131

6.3.1 Floating-Point Registers ..................................................................................... 131

6.3.2 Floating-Point Status/Control Register (FPSCR) ............................................... 133

6.3.3 Floating-Point Communication Register (FPUL)............................................... 136

6.4 Rounding............................................................................................................................ 137

6.5 Floating-Point Exceptions.................................................................................................. 138

6.5.1 General FPU Disable Exceptions and Slot FPU Disable Exceptions ................. 138

6.5.2 FPU Exception Sources ...................................................................................... 138

6.5.3 FPU Exception Handling.................................................................................... 139

6.6 Graphics Support Functions............................................................................................... 140

6.6.1 Geometric Operation Instructions....................................................................... 140

6.6.2 Pair Single-Precision Data Transfer.................................................................... 141

Section 7 Memory Management Unit (MMU)

............................................................ 143

7.1 Overview of MMU ............................................................................................................ 144

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Renesas SH7781 Manual do Utilizador Página 10