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Table 14.13 DMAC Pins in DDT Mode
Pin Name
Data bus request
Data bus available
Transfer request signal
DMAC strobe
Channel number
notification
Requests for DMA transfer from external devices are normally accepted only on channel 0
(
) and channel 1 (
available pin and channel-number-notification (
14.6.3
Register Configuration (SH7751R)
Table 14.14 shows the configuration of the DMAC's registers. The DMAC of the SH7751R has a
total of 33 registers: four registers are assigned to each channel, and there is a control register for
the overall control of the DMAC.
Rev. 3.0, 04/02, page 552 of 1064
Abbreviation
(
)
/
(DRAK0)
(
)
(DACK0)
ID[1:0]
(DRAK1, DACK1)
). In DDT mode, the
I/O
Function
Input
Data bus release request from external
device for DTR format input
Output
Data bus release notification
Data bus can be used 2 cycles after
is asserted
Notification of channel number to
external device at same time as
output
Input
If asserted 2 cycles after
assertion, DTR format is sent
Only
asserted: DMA request
and
simultaneously: Direct request to
channel 2
Output
Reply strobe signal for external device
from DMAC
Output
Notification of channel number to
external device at same time as
output
(ID [1] = DRAK1, ID [0] = DACK1)
pin functions as both the data-bus-
) pin.
asserted
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