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SH7708 データシート(PDF) 432 Page - Renesas Technology Corp

部品番号 SH7708
部品情報  SuperH??RISC engine
PDF  633 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7708 データシート(HTML) 432 Page - Renesas Technology Corp

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Serial Data Transmission: The handling procedures in the smart card mode differ from ordinary
SCI processing because data is retransmitted when an error signal is sampled during a data
transmission. This results in the transmission processing flowchart shown in figure 14.6.
1. Initialize the smart card interface mode as described in initialization above.
2. Check that the FER/ERS bit in SCSSR is cleared to 0.
3. Repeat steps 2 and 3 until the TEND flag in SCSSR is set to 1.
4. Write the transmit data into SCTDR, clear the TDRE flag to 0 and start transmitting. The
TEND flag will be cleared to 0.
5. To transmit more data, return to step 2.
6. To end transmission, clear the TE bit to 0.
This processing can be interrupted. When the TIE bit is set to 1 and interrupt requests are enabled,
a transmit-data-empty interrupt (TXI) will be requested when the TEND flag is set to 1 at the end
of the transmission. When the RIE bit is set to 1 and interrupt requests are enabled, a
communication error interrupt (ERI) will be requested when the ERS flag is set to 1 when an error
occurs in transmission. See Interrupt Operation below for more information.



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