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H8/3028F 数据表(PDF) 260 Page - Renesas Technology Corp

部件名 H8/3028F
功能描述  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
PDF  923 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3028F 数据表(HTML) 260 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page 230 of 890
Figure 7.14 shows the timing when the DMAC is activated by low input at a
DREQ pin. This
example shows a word-size transfer from a 16-bit two-state access area to another 16-bit two-state
access area. The DMAC continues the transfer while the
DREQ pin is held low.
φ
DREQ
RD
HWR
TEND
T1
T2
T3
Td
T1
T2
T1
T2
T1
T2
Td
T1
T2
T1
T2
T1
T2
LWR
,
CPU cycle
DMAC cycle
CPU cycle
DMAC cycle
(last transfer cycle)
CPU cycle
Source
address
Destination
address
Source
address
Destination
address
Address
bus
Figure 7.14 Bus Timing of DMA Transfer Requested by Low
DREQ
DREQ
DREQ
DREQ Input



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