HD6412350 Hitachi, HD6412350 Datasheet - Page 275
HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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7.5.9
Basic DMAC Bus Cycles
An example of the basic DMAC bus cycle timing is shown in figure 7-18. In this example, word-
size transfer is performed from 16-bit , 2-state access space to 8-bit, 3-state access space. When
the bus is transferred from the CPU to the DMAC, a source address read and destination address
write are performed. The bus is not released in response to another bus request, etc., between
these read and write operations. As with CPU cycles, DMA cycles conform to the bus controller
settings.
CPU cycle
DMAC cycle (1-word transfer)
CPU cycle
T
T
T
T
T
T
T
T
1
2
1
2
3
1
2
3
ø
Source
Destination address
address
Address bus
RD
HWR
LWR
Figure 7-18 Example of DMA Transfer Bus Timing
The address is not output to the external address bus in an access to on-chip memory or an internal
I/O register.
255
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