Rev. 2.00, 09/03, page xxiii of xlvi
8.3.3
DMA Transfer Count Registers (DMATCR) .................................................... 243
8.3.4
DMA Channel Control Registers (CHCR)........................................................ 243
8.3.5
DMA Operation Register (DMAOR) ............................................................... 248
8.3.6
DMA Extended Resource Selectors 0, 1 (DMARS0, DMARS1)....................... 250
8.4
Operation..................................................................................................................... 252
8.4.1
Transfer Flow.................................................................................................. 252
8.4.2
DMA Transfer Requests .................................................................................. 254
8.4.3
Channel Priority .............................................................................................. 257
8.4.4
DMA Transfer Types....................................................................................... 260
8.4.5
Number of Bus Cycle States and DREQ Pin Sampling Timing ......................... 267
8.5
Precautions .................................................................................................................. 270
8.5.1
Precautions when Mixing Cycle-Steal Mode Channels and Burst Mode
Channels ......................................................................................................... 270
Section 9 Clock Pulse Generator (CPG)......................................................... 271
9.1
Features ....................................................................................................................... 271
9.2
Input/Output Pins......................................................................................................... 274
9.3
Clock Operating Modes................................................................................................ 275
9.4
Register Descriptions ................................................................................................... 279
9.4.1
Frequency Control Register (FRQCR).............................................................. 279
9.4.2
USB Clock Frequency Control Register (UCLKCR) ........................................ 281
9.4.3
Usage Notes .................................................................................................... 281
9.5
Changing Frequency .................................................................................................... 282
9.5.1
Changing Multiplication Rate .......................................................................... 282
9.5.2
Changing Division Ratio.................................................................................. 282
9.5.3
Modification of Clock Operating Mode............................................................ 282
9.6
Usage Notes................................................................................................................. 283
Section 10 Watchdog Timer (WDT) .............................................................. 285
10.1
Features ....................................................................................................................... 285
10.2
Register Descriptions ................................................................................................... 286
10.2.1 Watchdog Timer Counter (WTCNT)................................................................ 286
10.2.2 Watchdog Timer Control/Status Register (WTCSR)......................................... 287
10.2.3 Notes on Register Access................................................................................. 289
10.3
Operation..................................................................................................................... 290
10.3.1 Canceling Software Standbys........................................................................... 290
10.3.2 Changing Frequency........................................................................................ 291
10.3.3 Using Watchdog Timer Mode.......................................................................... 291
10.3.4 Using Interval Timer Mode.............................................................................. 291
Section 11 Power-Down Modes..................................................................... 293
11.1
Features ....................................................................................................................... 293
11.2
Input/Output Pins......................................................................................................... 295
Содержание SH7705
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