HD6412350 Hitachi, HD6412350 Datasheet - Page 272

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

7.5.8
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
Activation Source
Internal
Interrupts
External
Requests
Auto-request
Legend
X : Cannot be specified
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 ADI, 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
252
: Can be specified
DMAC Activation Sources
ADI
TXI0
RXI0
TXI1
RXI1
TGI0A
TGI1A
TGI2A
TGI3A
TGI4A
TGI5A
DREQ pin falling edge input
DREQ pin low-level input
Channels
0A and 1A
X
X
X
Short Address Mode
Channels
0B and 1B
X
Normal
Mode
X
X
X
X
X
X
X
X
X
X
X
Full Address Mode
Block
Transfer
Mode
X