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H8/3021 Datasheet(PDF) 378 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 378 Page - Renesas Technology Corp |
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378 / 712 page ![]() 11. Serial Communication Interface Rev.2.00 Mar. 22, 2007 Page 354 of 684 REJ09B0352-0200 Table 11.4 Examples of Bit Rates and BRR Settings in Synchronous Mode φ (MHz) Bit Rate 2 4 8 10 16 18 (bits/s) n N n N n N n N n N n N 110 3 70 — — — — — — — — — — 250 2 124 2 249 3 124 — — 3 249 — — 500 1 249 2 124 2 249 — — 3 124 3 140 1 k 1 124 1 249 2 124 — — 2 249 3 69 2.5 k 0 199 1 99 1 199 1 249 2 99 2 112 5 k 0 99 0 199 1 99 1 124 1 199 1 224 10 k 0 49 0 99 0 199 0 249 1 99 1 112 25 k 0 19 0 39 0 79 0 99 0 159 0 179 50 k 0 9 0 19 0 39 0 49 0 79 0 89 100 k 0 4 0 9 0 19 0 24 0 39 0 44 250 k 0 1 0 3 0 7 0 9 0 15 0 17 500 k 0 0* 0 1 0 3 0 4 0 7 0 8 1 M 0 0* 0 1 — — 0 3 0 4 2 M 0 0* — — 0 1 — — 2.5 M — — 0 0* — — — — 4 M 0 0* — — Legend Blank: No setting available —: Setting possible, but error occurs *: Continuous transmission/reception not possible The BRR setting is calculated as follows: Asynchronous mode: φ N = 64 × 22n-1 × B × 106 – 1 Synchronous mode: φ N = 8 × 22n-1 × B × 106 – 1 B: Bit rate (bits/s) N: BRR setting for baud rate generator (0 ≤ N ≤ 255) φ: System clock frequency (MHz) n: Baud rate generator clock source (n = 0, 1, 2, 3) |
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