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SH7721 Datasheet(PDF) 1088 Page - Renesas Technology Corp |
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SH7721 Datasheet(HTML) 1088 Page - Renesas Technology Corp |
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1088 / 1524 page  Section 30 SIM Card Module (SIM) Rev. 3.00 Jan. 18, 2008 Page 1026 of 1458 REJ09B0033-0300 (6) Transmit End Interrupt In continuous transmission, when the TEIE bit is always set to 1, the TEND bit is set to 1 at a transmit end. Therefore, the unnecessary transmit end interrupt (TEI) request occurs. When SCTSR starts transmitting after the last transmit data is written to SCTDR, the TEIE bit in SCSCR should be set to 1 so that the occurrence of the unnecessary TEI interrupt request can be prevented. The waveform of the timing to set the TEIE bit to 1 is shown in figure 30.12. D0 D1 D2 D3 D4 D5 D6 D7 DP Ds D0 D1 D2 D3 D4 D5 D6 D7 DP Ds D0 D1 D2 D3 D4 D5 D6 D7 DP Ds TEND TDRE (DE) (DE) TEIE (DE) Transmit frame Transmit frame Last frame Unnecessary TEND set timing TEIE set timing TEI request Figure 30.12 TEIE Set Timing |
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