Renesas HD6417641, SH7641 - page 14

Rev. 4.00 Sep. 14, 2005 Page xiv of l
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