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H8/3028 数据表(PDF) 8 Page - Renesas Technology Corp

部件名 H8/3028
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

H8/3028 数据表(HTML) 8 Page - Renesas Technology Corp

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Rev. 2.00, 09/03, page viii of xxx
Item
Page
Revision (See Manual for Details)
7.4.8 DMAC Bus
Cycle
Figure 7.14 Bus
Timing of DMA Transfer
Requested by Low
DREQ Input
230
Figure amended
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 7.15 Burst
DMA Bus Timing
231
Figure amended
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 7.16 Timing of
DMAC Activation by
Falling Edge of
DREQ
in Normal Mode
232
Figure amended
φ
DREQ
RD
HWR
T2
T1
T2
T1
T2
Td
T1
T2
T1
T2
T1
T2
Td
T1
T2
LWR
,
CPU cycle
DMAC cycle
CPU
cycle
DMAC cycle
Minimum 4 states
Next sampling point
Address
bus



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