D12320VF25IV Datasheet, PDF (311/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 7 DMA Controller (Not Supported in the H8S/2321)
7.5.8 DMAC Activation Sources
DMAC activation sources consist of internal interrupts, external requests, and auto-requests. The
activation sources that can be specified depend on the transfer mode and the channel, as shown in
table 7.12.
Table 7.12 DMAC Activation Sources
Short Address Mode
Activation Source
Channels
0A and 1A
Internal ADI
Interrupts _TXI0
RXI0
TXI1
RXI1
TGI0A
TGI1A
TGI2A
TGI3A
TGI4A
TGI5A
External DREQ pin falling edge input X
Requests _{DREQ pin low-level input X}
Auto-request
X
Legend:
: Can be specified
X : Cannot be specified
Channels
0B and 1B
X
Full Address Mode
Normal
Mode
Block
Transfer
Mode
X
X
X
X
X
X
X
X
X
X
X
X
Activation by Internal Interrupt: An interrupt request selected as a DMAC activation source
can be sent simultaneously to the CPU and DTC. For details, see section 5, Interrupt Controller.
With activation by an internal interrupt, the DMAC accepts the request independently of the
interrupt controller. Consequently, interrupt controller priority settings are irrelevant.
If the DMAC is activated by a CPU interrupt source or an interrupt source that is not used as a
DTC activation source (DTA = 1), the interrupt source flag is cleared automatically by the DMA
transfer. With ADI, TXI, and RXI interrupts, however, the interrupt source flag is not cleared
Rev.6.00 Sep. 27, 2007 Page 279 of 1268
REJ09B0220-0600