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SH7708 数据表(PDF) 439 Page - Renesas Technology Corp

部件名 SH7708
功能描述  SuperH??RISC engine
PDF  633 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

SH7708 数据表(HTML) 439 Page - Renesas Technology Corp

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421
Retransmission by the SCI in Transmit Mode: Figure 14.10 shows the retransmission operation
in the SCI transmit mode.
1. After transmission of one frame is completed, the FER/ERS bit in SCSSR is set to 1 when a
error signal is returned from the receiving side. If the RIE bit in SCSCR is enabled at this time,
an ERI interrupt is requested. Be sure to clear the FER/ERS bit before the next parity bit is
sampled.
2. The TEND bit in SCSSR is not set in the frame that received the error signal that indicated the
error.
3. The FER/ERS bit in SCSR is not set when no error signal is returned from the receiving side.
4. When no error signal is returned from the receiving side, the TEND bit in SCSSR is set to 1
when the transmission of the frame that includes the retransmission is considered completed. If
the TIE bit in SCSCR is enabled at this time, a TXI interrupt will be requested.
D0
Ds
D2
D1
D4
D3
D6
D5
Dp DE
D7
D0
Ds
D2
D1
D4
D3
D6
D5
Dp
(DE)
D7
D0
Ds
D2
D1
D4
D3
nth transfer frame
TEND
FER/ERS
Transfer from TDR to TRS
Transfer from TDR to TRS
Transfer from
TDR to TRS
1
2
4
3
Retransmitted frame
Transfer frame n + 1
TDRE
Figure 14.10 Retransmission in SCI Transmit Mode



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