9
9-37
Ver.0.10
DMAC
9.3 Functional Description of the DMAC
9.3.10 End of DMA and Interrupt
In normal mode, DMA transfer is terminated when the transfer count register underflows. When
transfer finishes, the transfer enable bit is cleared to 0 and transfers are thereby disabled. Also, an
interrupt request is generated at completion of transfer. However, this interrupt is not generated for
channels where interrupt requests have been masked by the DMA Interrupt Mask Register.
During ring buffer mode, the transfer count register operates in free-run mode, and transfer
continues until the transfer enable bit is cleared to 0 (to disable transfer). In this case, therefore, the
DMA transfer-completed interrupt request is not generated. Nor is this interrupt request generated
even when transfer in ring buffer mode is terminated by clearing the transfer enable bit.
9.3.11 Status of Each Register after Completion of DMA Transfer
When DMA transfer is completed, the status of the source address and destination address
registers becomes as follows:
(1) Address fixed
• The value set in the address register before DMA transfer started remains intact (fixed).
(2) Address incremental
• For 8-bit transfer, the value of the address register is the last transfer a 1.
• For 16-bit transfer, the value of the address register is the last transfer a 2.
The transfer count register when DMA transfer completed is in an underflow state (H'FF).
Therefore, to perform another DMA transfer, set the transfer count register newly again, except
when you are performing transfers 256 times (H'FF).
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 ...