H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 296

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 7 DMA Controller (DMAC)
When using the DMAC for single address mode reading, transfer is performed from external
memory to the external device, and the DACK pin functions as a write strobe for the external
device. When using the DMAC for single address mode writing, transfer is performed from the
external device to external memory, and the DACK pin functions as a write strobe for the external
device. Since there is no directional control for the external device, one or other of the above
single directions should be used.
Bus cycles in single address mode are in accordance with the settings of the bus controller for the
external memory area. On the external device side, DACK is output in synchronization with the
address strobe. For details of bus cycles, see section 7.5.11, DMAC Bus Cycles (Single Address
Mode).
Do not specify internal space for transfer addresses in single address mode.
Rev. 3.00 Sep 15, 2006 page 262 of 988
REJ09B0330-0300
H8S/2350 Group
Figure 7.17 Data Bus in Single Address Mode
(high impedance)
HWR, LWR
D
A
23
15
DACK
to D
to A
RD
0
0
Address bus
(Read)
(Write)
External
External
memory
device