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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST10F296 датащи(PDF) 202 Page - STMicroelectronics |
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ST10F296 датащи(HTML) 202 Page - STMicroelectronics |
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202 / 346 page  Obsolete Product(s) - Obsolete Product(s) CAN modules ST10F296E 202/346 17.7.2 Example of bit timing at low baud rate In this example, the frequency of the CAN module clock is 2 MHz, BRP is 1, the bit rate is 100 Kbit/s. tq 1 µs = 2 x tCPU Delay of bus driver 200 ns Delay of receiver circuit 80 ns Delay of bus line (40m) 220 ns tProp 1 µs = 1 x tq tSJW 4 µs = 4 x tq tPB1 4 µs = 4 x tq tSeg1 = tProp + tPB1 5 µs = 5 x tq tSeg2 = tPB2 4 µs = Information processing time + 3 x tq = 4 x tq tSync-Seg 1 µs = 1 x tq tBT 10 µs = tSync-Seg + tSeg1 + tSeg2 = 10 x tq Tolerance for CAN clock 1.58 % = δPLL (13 x tBT = 13 x 10 x tq = 260 tCPU) 10 ns = Data from PLL jitter characteristics Tolerance for oscillator (no PLL effect 1.57 % = In this example, the concatenated bit time parameters are (4-1)3 & (5-1)4 & (4-1)2 & (2-1)6, the bit timing register CANxBTR is programmed to = 0x34C1h. min t PB1 tPB2 , () 13 t BT × t PB2 – () ÷ 4 µs () 213 10 µs () 4 µs () – × () × ⁄ = min t PB1 tPB2 , () 2 δ PLL × 213 t BT × t PB2 – () × ⁄ – Obsolete Product(s) - Obsolete Product(s) |
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