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H8S2245 Datasheet(PDF) 531 Page - Renesas Technology Corp |
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H8S2245 Datasheet(HTML) 531 Page - Renesas Technology Corp |
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531 / 818 page  Section 13 Smart Card Interface Rev.3.00 Mar. 26, 2007 Page 489 of 772 REJ09B0355-0300 The method of calculating the value to be set in the bit rate register (BRR) from the operating frequency and bit rate, on the other hand, is shown below. N is an integer, 0 ≤ N ≤ 255, and the smaller error is specified. N = φ 1488 × 22n–1 × B × 106 – 1 Table 13.6 Examples of BRR Settings for Bit Rate B (bit/s) (When n = 0) φφφφ (MHz) 7.1424 10.00 10.7136 13.00 14.2848 16.00 18.00 20.00 bit/s N Error N Error N Error N Error N Error N Error N Error N Error 9600 0 0.00 1 30 1 25 1 8.99 1 0.00 1 12.01 2 15.99 2 6.60 Table 13.7 Maximum Bit Rate at Various Frequencies (Smart Card Interface Mode) φφφφ (MHz) Maximum Bit Rate (bit/s) N n 7.1424 9600 0 0 10.00 13441 0 0 10.7136 14400 0 0 13.00 17473 0 0 14.2848 19200 0 0 16.00 21505 0 0 18.00 24194 0 0 20.00 26882 0 0 The bit rate error is given by the following formula: Error (%) = ( φ 1488 × 22n–1 × B × (N + 1) × 106 – 1) × 100 |
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