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SH7708 数据表(PDF) 438 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) 438 Page - Renesas Technology Corp

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14.4.2
Retransmission (Receive and Transmit Modes)
Retransmission by the SCI in Receive Mode: Figure 14.9 shows the retransmission operation in
the SCI receive mode.
1. When the received parity bit is checked and an error is found, the PER bit in SCSSR is
automatically set to 1. If the RIE bit in SCSCR is enabled at this time, an ERI interrupt is
requested. Be sure to clear the PER bit before the next parity bit is sampled.
2. The RDRF bit in SCSSR is not set in the frame that caused the error.
3. When the received parity bit is checked and no error is found, the PER bit in SCSSR is not set.
4. When the received parity bit is checked and no error is found, reception is considered to have
been completed normally and the RDRF bit in SCSSR is automatically set to 1. If the RIE bit
in SCSCR is enabled at this time, an RXI interrupt is requested.
5. When a normal frame is received, the pin maintains a three-state status when it transmits the
error signal.
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
RDRF
PER
2
1
4
5
3
Retransmitted frame
Transfer frame n + 1
Figure 14.9 Retransmission in SCI Receive Mode



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