332
Channel 3: In this channel, direct address mode or indirect address transfer mode can be
specified.
•
Reload function: The value that was specified in the source address register can be
automatically reloaded every four DMA transfers. This function is only available in channel 2.
•
Transfer requests
External request (From two
DREQ
pins (channels 0 and 1 only).
DREQ
can be detected
either by the falling edge or by low level.)
On-chip module request (Requests from on-chip peripheral modules such as serial
communications interface (IrDA and SCIF), A/D converter (A/D) and a timer (CMT). This
request can be accepted in all the channels.)
Auto request (The transfer request is generated automatically within the DMAC.)
•
Selectable bus modes: Cycle-steal mode or burst mode
•
Selectable channel priority levels:
Fixed mode: The channel priority is fixed.
Round-robin mode: The priority of the channel in which the execution request was accepted is
made the lowest.
•
Interrupt request: An interrupt request to the CPU can be generated after the specified number
of transfers.
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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