SH7641 Datasheet, PDF (14/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

3.1.5 Shift Operations .................................................................................................... 109
3.1.6 Most Significant Bit Detection Operation ............................................................ 112
3.1.7 Rounding Operation.............................................................................................. 115
3.1.8 Overflow Protection.............................................................................................. 117
3.1.9 Data Transfer Operation ....................................................................................... 118
3.1.10 Local Data Move Instruction ................................................................................ 122
3.1.11 Operand Conflict .................................................................................................. 123
3.2 DSP Addressing................................................................................................................. 124
3.2.1 DSP Repeat Control.............................................................................................. 124
3.2.2 DSP Data Addressing ........................................................................................... 132
Section 4 Clock Pulse Generator (CPG) ........................................................... 143
4.1 Features.............................................................................................................................. 143
4.2 Input/Output Pins............................................................................................................... 146
4.3 Clock Operating Modes ..................................................................................................... 146
4.4 Register Descriptions......................................................................................................... 149
4.4.1 Frequency Control Register (FRQCR) ................................................................. 149
4.5 Changing the Frequency .................................................................................................... 151
4.5.1 Changing the Multiplication Rate......................................................................... 151
4.5.2 Changing the Division Ratio................................................................................. 151
4.6 Notes on Board Design ...................................................................................................... 152
Section 5 Watchdog Timer (WDT) ................................................................... 155
5.1 Features.............................................................................................................................. 155
5.2 Register Descriptions......................................................................................................... 156
5.2.1 Watchdog Timer Counter (WTCNT).................................................................... 156
5.2.2 Watchdog Timer Control/Status Register (WTCSR)............................................ 157
5.2.3 Notes on Register Access ..................................................................................... 159
5.3 Use of the WDT................................................................................................................. 159
5.3.1 Canceling Standbys .............................................................................................. 159
5.3.2 Changing the Frequency ....................................................................................... 160
5.3.3 Using Watchdog Timer Mode .............................................................................. 160
5.3.4 Using Interval Timer Mode .................................................................................. 161
5.4 Precautions to Take when Using the WDT........................................................................ 161
Section 6 Power-Down Modes.......................................................................... 163
6.1 Features.............................................................................................................................. 163
6.1.1 Power-Down Modes ............................................................................................. 163
6.1.2 Reset ..................................................................................................................... 164
6.1.3 Input/Output Pins.................................................................................................. 165
Rev. 4.00 Sep. 14, 2005 Page xiv of l