Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 328 of 760
Channel 3: In this channel, direct address mode or indirect address transfer mode can be
specified.
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.
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.)
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.
made the lowest.
•
Interrupt request: An interrupt request to the CPU can be generated after the specified number
of transfers.
of transfers.