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H8/3003 数据表(PDF) 236 Page - Renesas Technology Corp

部件名 H8/3003
功能描述  microcontroller (MCU)
PDF  715 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8/3003 数据表(HTML) 236 Page - Renesas Technology Corp

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Figure 8-15 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.
Figure 8-16 shows the timing when the DMAC is activated by the falling edge of
DREQ in normal
mode.
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
T1
T2
ø
A
to A
RD
HWR
23
0
LWR
,
CPU cycle
DMAC cycle
Source
address
Destination
address
CPU cycle
Td
218



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