H8SSLASH2214 datasheet(290/936 Pages) RENESAS

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Section 7 DMA Controller

Rev.4.00 Sep. 18, 2008 Page 230 of 872

REJ09B0189-0400

7.5.7

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

Full Address Mode

Activation Source

Channels

0A and 1A

Channels

0B and 1B

Normal

Mode

Block

Transfer

Mode

TXI0

RXI0

TXI1

RXI1

TGI0A

TGI1A

Internal

Interrupts

TGI2A

DREQ pin falling edge input X

External

Requests

DREQ pin low-level input

Auto-request

Legend:

: Can be specified

X : Cannot be specified

(1) 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 not accepted.

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 TXI and RXI interrupts, however, the interrupt source flag is not cleared unless the

prescribed register is accessed in a DMA transfer. If the same interrupt is used as an activation

source for more than one channel, the interrupt request flag is cleared when the highest-priority

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