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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST10F296 数据表(PDF) 83 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 83 Page - STMicroelectronics |
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83 / 346 page  Obsolete Product(s) - Obsolete Product(s) ST10F296E The bootstrap loader 83/346 Error induced by the baud rate calculation The content of the PT0 timer counter corresponds to 29 bit times. This gives the following equation: Equation 4 where BRP (bit rate prescaler), Tseg1 and Tseg2 are the field of the CAN bit timing register. The CAN protocol specification recommends implementing a bit time composed of at least eight time quantum (tq). This recommendation has been applied above. The maximum bit time length is 25 tq. To achieve good precision, the target must have the smallest BRP and the maximum number of tq in a bit time. The ranges for PT0 according to BRP are given in Equation 5. Equation 5 8 ≤ 1 + Tseg1 + Tseg2 ≤ 25 464 x (1 + BRP) ≤ PT0 ≤ 1450 x (1 + BRP) The error coming from the measurement of bit 29 is: It is maximal for the smallest BRP value and the smallest number of ticks in PT0. Therefore: e1 Max = 1.29% For the best precision possible, the target must have the smallest BRP, which minimises errors when calculating time quanta in a bit time. Table 39. Timer content ranges of BRP value in Equation 5 BRP PT0_min PT0_max Comments 0 464 1450 1 1451 2900 2 2901 4350 3 4351 5800 4 5801 7250 5 7251 8700 .. .. .. 43 20416 63800 44 20880 65250 45 21344 66700 Possible timer overflow .. .. .. 63 X X PT0 58 BRP 1 + () × 1Tseg1 Tseg2 ++ () × = e 1 6PTO [] ⁄ = Obsolete Product(s) - Obsolete Product(s) |
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