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H8/3021 Datasheet(PDF) 440 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 440 Page - Renesas Technology Corp |
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440 / 712 page  12. Smart Card Interface Rev.2.00 Mar. 22, 2007 Page 416 of 684 REJ09B0352-0200 12.4 Usage Note The following points should be noted when using the SCI as a smart card interface. Receive Data Sampling Timing and Reception Margin in Smart Card Interface Mode: In smart card interface mode, the SCI operates on a basic clock with a frequency of 372 times the transfer rate. In reception, the SCI samples the falling edge of the start bit using the basic clock, and performs internal synchronization. Receive data is latched internally at the rising edge of the 186th pulse of the basic clock. This is illustrated in figure 12.7. Internal basic clock 372 clocks 186 clocks Receive data (RxD) Synchro- nization sampling timing D0 D1 Data sampling timing 185 371 0 371 185 0 0 Start bit Figure 12.7 Receive Data Sampling Timing in Smart Card Mode |
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