HD64F3048F16 Datasheet, PDF (267/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 8 DMA Controller
8.4.7 DMAC Activation
The DMAC can be activated by an internal interrupt, external request, or auto-request. The
available activation sources differ depending on the transfer mode and channel as indicated in
table 8.11.
Table 8.11 DMAC Activation Sources
Activation Source
Internal
interrupts
IMIA0
IMIA1
IMIA2
IMIA3
TXI0
RXI0
External
requests
Falling edge of
DREQ
Low input at
DREQ
Auto-request
Short Address Mode
Channels
0A and 1A
Channels
0B and 1B
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
No
Full Address Mode
Normal
No
No
No
No
No
No
Yes
Block
Yes
Yes
Yes
Yes
No
No
Yes
Yes
No
Yes
No
Activation by Internal Interrupts
When an interrupt request is selected as a DMAC activation source and the DTE bit is set to 1, that
interrupt request is not sent to the CPU. It is not possible for an interrupt request to activate the
DMAC and simultaneously generate a CPU interrupt.
When the DMAC is activated by an interrupt request, the interrupt request flag is cleared
automatically. If the same interrupt is selected to activate two or more channels, the interrupt
request flag is cleared when the highest-priority channel is activated, but the transfer request is
held pending on the other channels in the DMAC, which are activated in their priority order.
Rev. 3.00 Sep 27, 2006 page 239 of 872
REJ09B0325-0300