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R01UH0025EJ0300 Rev. 3.00
Page xv of xxxii
Sep 24, 2010
Section 11 Direct Memory Access Controller (DMAC) ...................................303
11.1
Features............................................................................................................................. 303
11.2
Input/Output Pins .............................................................................................................. 305
11.3
Register Descriptions ........................................................................................................ 306
11.3.1
DMA Current Source Address Register (DMCSADR) .................................... 310
11.3.2
DMA Current Destination Address Register (DMCDADR) ............................ 311
11.3.3
DMA Current Byte Count Register (DMCBCT) .............................................. 312
11.3.4
DMA Reload Source Address Register (DMRSADR) ..................................... 313
11.3.5
DMA Reload Destination Address Register (DMRDADR) ............................. 314
11.3.6
DMA Reload Byte Count Register (DMRBCT) ............................................... 315
11.3.7
DMA Mode Register (DMMOD) ..................................................................... 316
11.3.8
DMA Control Register A (DMCNTA) ............................................................. 322
11.3.9
DMA Control Register B (DMCNTB) ............................................................. 330
11.3.10
DMA Activation Control Register (DMSCNT)................................................ 336
11.3.11
DMA Interrupt Control Register (DMICNT).................................................... 337
11.3.12
DMA Common Interrupt Control Register (DMICNTA) ................................. 338
11.3.13
DMA Interrupt Status Register (DMISTS) ....................................................... 339
11.3.14
DMA Transfer End Detection Register (DMEDET) ........................................ 340
11.3.15
DMA Arbitration Status Register (DMASTS).................................................. 342
11.4
Operation .......................................................................................................................... 344
11.4.1
DMA Transfer Mode ........................................................................................ 344
11.4.2
DMA Transfer Condition.................................................................................. 346
11.4.3
DMA Activation ............................................................................................... 350
11.5
Completion of DMA Transfer and Interrupts ................................................................... 351
11.5.1
Completion of DMA Transfer........................................................................... 351
11.5.2
DMA Interrupt Requests................................................................................... 352
11.5.3
DMA End Signal Output .................................................................................. 354
11.6
Suspending, Restarting, and Stopping of DMA Transfer ................................................. 356
11.6.1
Suspending and Restarting DMA Transfer ....................................................... 356
11.6.2
Stopping DMA Transfer on Any Channel ........................................................ 356
11.7
DMA Requests.................................................................................................................. 357
11.7.1
Sources of DMA Requests................................................................................ 357
11.7.2
Synchronous Circuits for DMA Request Signals.............................................. 357
11.7.3
Sense Mode for DMA Requests........................................................................ 358
11.8
Determining DMA Channel Priority................................................................................. 361
11.8.1
Channel Priority Order...................................................................................... 361
11.8.2
Operation during Multiple DMA Requests....................................................... 361
11.8.3
Output of the DMA Acknowledge and DNA Active Signals ........................... 362
11.9
Units of Transfer and Positioning of Bytes for Transfer................................................... 364
11.10 Reload Function................................................................................................................ 365