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SH7052 bảng dữ liệu(PDF) 191 Page - Renesas Technology Corp

tên linh kiện SH7052
Giải thích chi tiết về linh kiện  SuperHTM RISC engine
PDF  919 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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SH7052 bảng dữ liệu(HTML) 191 Page - Renesas Technology Corp

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9.3.8
Bus Mode and Channel Priorities
If, for example, a transfer request is issued for channel 0 while transfer is in progress on lower-
priority channel 1 in burst mode, transfer is started immediately on channel 0.
In this case, if channel 0 is set to burst mode, channel 1 transfer is continued after completion of
all transfers on channel 0. If channel 0 is set to cycle-steal mode, channel 1 transfer is continued
only if a channel 0 transfer request has not been issued; if a transfer request is issued, channel 0
transfer is started immediately.
9.3.9
Source Address Reload Function
Channel 2 has a source address reload function. This returns to the first value set in the source
address register (SAR2) every four transfers by setting the RO bit of CHCR2 to 1. Figure 9.10
illustrates this operation. Figure 9.11 is a timing chart for reload ON mode, with burst mode, auto-
request, 16-bit transfer data size, SAR2 increment, and DAR2 fixed.
SAR2
(initial value)
DMAC
Transfer
request
DMAC control block
Reload control
4th count
CHCR2
DMATCR2
SAR2
RO bit = 1
Count signal
Reload
signal
Reload signal
Figure 9.10 Source Address Reload Function



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