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HT46RU66 Datasheet(PDF) 44 Page - Holtek Semiconductor Inc |
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HT46RU66 Datasheet(HTML) 44 Page - Holtek Semiconductor Inc |
44 / 69 page HT46RU66/HT46CU66 Rev. 1.40 44 2014-06-06 · 波特率和误差的计算 系统选用 8M 晶振且 BRGH=0,若期望的波特率为 9600,计算它的 BRG 寄存器的值 N, 实际波特率和误差。 根据上表,波特率 BR = ) 1 ( 64 + N f SYS 转换后的公式 N = 1 64 * − BR f SYS 代入参数 N = 1 64 * 9600 8000000 − =12.0208 取最接近的值,十进制 12 写入 BRG 寄存器,实际波特率如下 BR = 9615 ) 1 12 ( 64 8000000 = + 误差 % 16 . 0 9600 9600 9615 = − 下面两表给出 BRGH 取不同值时的实际波特率和误差。 波特率 K/BPS BRGH=0 f SYS =8MHz f SYS =7.159MHz f SYS =4MHz f SYS =3.579545MHz BRG Kbaud Error BRG Kbaud Error BRG Kbaud Error BRG Kbaud Error 0.3 - - - - - - 207 0.300 0.00 185 0.300 0.00 1.2 103 1.202 0.16 92 1.203 0.23 51 1.202 0.16 46 1.19 -0.83 2.4 51 2.404 0.16 46 2.38 -0.83 25 2.404 0.16 22 2.432 1.32 4.8 25 4.807 0.16 22 4.863 1.32 12 4.808 0.16 11 4.661 -2.9 9.6 12 9.615 0.16 11 9.322 -2.9 6 8.929 -6.99 5 9.321 -2.9 19.2 6 17.857 -6.99 5 18.64 -2.9 2 20.83 8.51 2 18.643 -2.9 38.4 2 41.667 8.51 2 37.29 -2.9 1 - - 1 - - 57.6 1 62.5 8.51 1 55.93 -2.9 0 62.5 8.51 0 55.93 -2.9 115.2 0 125 8.51 0 111.86 -2.9 - - - - - - BRGH=0 时的波特率和误差 波特率 K/BPS BRGH=1 f SYS =8MHz f SYS =7.159MHz f SYS =4MHz f SYS =3.579545MHz BRG Kbaud Error BRG Kbaud Error BRG Kbaud Error BRG Kbaud Error 0.3 - - - - - - - - - - - - 1.2 - - - - - - 207 1.202 0.16 185 1.203 0.23 2.4 207 2.404 0.16 185 2.405 0.23 103 2.404 0.16 92 2.406 0.23 4.8 103 4.808 0.16 92 4.811 0.23 51 4.808 0.16 46 4.76 -0.83 9.6 51 9.615 0.16 46 9.520 -0.832 25 9.615 0.16 22 9.727 1.32 19.2 25 19.231 0.16 22 19.454 1.32 12 19.231 0.16 11 18.643 -2.9 38.4 12 38.462 0.16 11 37.287 -2.9 6 35.714 -6.99 5 37.286 -2.9 57.6 8 55.556 -3.55 7 55.93 -2.9 3 62.5 8.51 3 55.930 -2.9 115.2 3 125 8.51 3 111.86 -2.9 1 125 8.51 1 111.86 -2.9 250 1 250 0 - - - 0 250 0 - - - BRGH=1 时的波特率和误差 |
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