9
9-2
Ver.0.10
9.1 Outline of the DMAC
The 32170 contains a 10 channel-DMA (Direct Memory Access) Controller. It allows you to transfer
data at high speed between internal peripheral I/Os, between internal RAM and internal peripheral I/O,
and between internal RAMs, as requested by a software trigger or from an internal peripheral I/O.
Table 9.1.1 Outline of the DMAC
Item
Description
Number of channel
10 channels
Transfer request
• Software trigger
• Request from internal peripheral I/Os: A-D converter, multijunction timer, or serial
I/O (reception completed, transmit buffer empty)
• Transfer operation can be cascaded between DMA channels (Note)
Maximum number
256 times
of times transferred
Transferable
• 64 Kbytes (address space from H'0080 0000 to H'0080 FFFF)
address space
• Transfers between internal peripheral I/Os, between internal RAM and internal
peripheral I/O, between internal RAMs are supported
Transfer data size
16 or 8 bits
Transfer method
Single transfer DMA (control of the internal bus is relinquished for each transfer
performed), dual-address transfer
Transfer mode
Single transfer mode
Direction of transfer
One of three modes can be selected for the source and destination:
• Address fixed
• Address incremental
• Ring buffered
Channel priority
Channel 0 > channel 1 > channel 2 > channel 3 > channel 4 > channel 5 > channel
6 > channel 7 > channel 8 > channel 9 (Priority is fixed)
Maximum transfer rate 13.3 Mbytes per second (with 20 MHz internal peripheral clock)
Interrupt request
Group interrupt request can be generated when each transfer count register underflows.
Transfer area
64 Kbytes from H'0080 0000 to H'0080 FFFF
(Transferable in the entire internal RAM/SFR area)
Note: Transfer operation can be cascaded between DMA channels as shown below.
Completion of one transfer in channel 0 starts DMA transfer in channel 1
Completion of one transfer in channel 1 starts DMA transfer in channel 2
Completion of one transfer in channel 2 starts DMA transfer in channel 0
Completion of one transfer in channel 3 starts DMA transfer in channel 4
Completion of one transfer in channel 5 starts DMA transfer in channel 6
Completion of one transfer in channel 6 starts DMA transfer in channel 7
Completion of one transfer in channel 7 starts DMA transfer in channel 5
Completion of one transfer in channel 8 starts DMA transfer in channel 9
Completion of all DMA transfers in channel 0 (transfer count register underflow) starts DMA transfer
in channel 5
DMAC
9.1 Outline of the DMAC
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...