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SH7721 bảng dữ liệu(PDF) 489 Page - Renesas Technology Corp

tên linh kiện SH7721
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
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Section 10
Direct Memory Access Controller (DMAC)
Rev. 3.00 Jan. 18, 2008 Page 427 of 1458
REJ09B0033-0300
Choose to detect DREQ by either the edge or level of the signal input with the DL bit and DS bit
in CHCR_0 and CHCR_1 as shown in table 10.4. The source of the transfer request does not have
to be the data transfer source or destination.
Table 10.4
Selecting External Request Detection with DL, DS Bits
CHCR_0 or CHCR_1
DL
DS
Detection of External Request
0
Low level detection
0
1
Falling edge detection
0
High level detection
1
1
Rising edge detection
When DREQ is accepted, the DREQ pin becomes request accept disabled state. After issuing
acknowledge signal DACK for the accepted DREQ, the DREQ pin again becomes request accept
enabled state.
When DREQ is used by level detection, there are following two cases by the timing to detect the
next DREQ after outputting DACK.
• Overrun 0: Transfer is aborted after the same number of transfer has been performed as
requests.
• Overrun 1: Transfer is aborted after transfers have been performed for (the number of requests
plus 1) times.
The DO bit in CHCR selects this overrun 0 or overrun 1.
Table 10.5
Selecting External Request Detection with DO Bit
CHCR_0 or CHCR_1
DO
External Request
0
Overrun 0
1
Overrun 1



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