User’s Manual U13850EJ6V0UD
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CHAPTER 12 DMA FUNCTIONS
12.1 Functions
The DMA (Direct Memory Access) controller transfers data between memory and peripheral I/Os based on DMA
requests sent from on-chip peripheral hardware (such as the serial interface, timer, or A/D converter).
This product includes six independent DMA channels that can transfer data in 8-bit and 16-bit units. The
maximum number of transfers is 256 (when transferring data in 8-bit units).
After a DMA transfer has occurred a specified number of times, DMA transfer completion interrupt (INTDMA0 to
INTDMA5) requests are output individually from the various channels.
The priority levels of the DMA channels are fixed as follows for simultaneous generation of multiple DMA transfer
requests.
DMA0 > DMA1 > DMA2 > DMA3 > DMA4 > DMA5
12.2 Transfer Completion Interrupt Request
After a DMA transfer has occurred a specified number of times and the TCn bit in the corresponding DMA channel
control register (DCHCn) has been set to 1, a DMA transfer completion interrupt request (INTDMA0 to INTDMA5) is
sent to the interrupt controller for each channel.
Содержание V850/SB1
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