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9
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Rev.1.0
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Operating on DMA related registers by a DMA transfer
When operating on DMA related registers using a DMA transfer (e.g., reloading the DMA related
registers with their initial values by a DMA transfer), do not write to any DMA related registers on the
local channel, i.e., the channel on which the DMA transfer is being performed. If this precaution is
neglected, device operation cannot be guaranteed.
Rewriting the DMA related registers by a DMA transfer is possible on only other channels. For
example, the DMAn Source Address and DMAn Destination Address Registers on channel 1 can
be rewritten by a DMA transfer through channel 0.
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About the DMA Interrupt Request Status Register
When writing to the DMA Interrupt Request Status Register to clear some bits, be sure to write 1 to
all bits other than those to be cleared. Any bit of this register is unaffected by writing 1, the bit
retains the value it had before writing.
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About the stable operation of DMA transfers
To ensure stable operation of DMA transfers, do not rewrite the DMA related registers unless
transfers are disabled, except for the DMA Channel Control Register's transfer enable bit. It is only
the DMA Source Address and Destination Address Registers that can be rewritten when transfers
are enabled, provided, however, that the rewriting is performed by a DMA transfer through another
channel.
DMAC
9.4 Precautions on Using DMAC
Summary of Contents for 32172
Page 20: ... This is a blank page 16 ...
Page 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Page 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Page 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Page 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Page 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Page 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Page 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Page 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Page 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Page 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...