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H8/3028F Datasheet(PDF) 261 Page - Renesas Technology Corp

Part # H8/3028F
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3028F Datasheet(HTML) 261 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 231 of 890
Figure 7.15 shows an auto-requested burst-mode transfer. This example shows a transfer of three
words from a 16-bit two-state access area to another 16-bit two-state access area.
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
φ
RD
,
CPU cycle
DMAC cycle
Source
address
Destination
address
CPU cycle
Td
Address
bus
HWR
LWR
Figure 7.15 Burst DMA Bus Timing
When the DMAC is activated from a
DREQ pin there is a minimum interval of four states from
when the transfer is requested until the DMAC starts operating. The
DREQ pin is not sampled
during the time between the transfer request and the start of the transfer. In short address mode and
normal mode, the pin is next sampled at the end of the read cycle. In block transfer mode, the pin
is next sampled at the end of one block transfer.



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