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H8S2245 Datasheet(PDF) 541 Page - Renesas Technology Corp |
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H8S2245 Datasheet(HTML) 541 Page - Renesas Technology Corp |
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541 / 818 page  Section 13 Smart Card Interface Rev.3.00 Mar. 26, 2007 Page 499 of 772 REJ09B0355-0300 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 13.10 Receive Data Sampling Timing in Smart Card Mode Thus the reception margin in asynchronous mode is given by the following formula. M = | (0.5 – 1 2N ) – (L – 0.5) F – | D – 0.5 | N (1 + F) | × 100% Where M: Reception margin (%) N: Ratio of bit rate to clock (N = 372) D: Clock duty (D = 0 to 1.0) L: Frame length (L = 10) F: Absolute value of clock frequency deviation Assuming values of F = 0 and D = 0.5 in the above formula, the reception margin formula is as follows. When D = 0.5 and F = 0, M = (0.5 – 1/2 × 372) × 100% = 49.866% |
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