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STR720 データシート(PDF) 250 Page - STMicroelectronics |
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STR720 データシート(HTML) 250 Page - STMicroelectronics |
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250 / 401 page  STR720 - CONTROLLER AREA NETWORK (CAN) 250/401 A given bit rate may be met by different bit time configurations, but for the proper function of the CAN network the physical delay times and the oscillator’s tolerance range have to be considered. Figure 35. Bit Timing Table 56. CAN Bit Time Parameters Parameter Range Remark BRP [1 .. 32] defines the length of the time quantum tq Sync_Seg 1 tq fixed length, synchronization of bus input to system clock Prop_Seg [1.. 8] tq compensates for the physical delay times Phase_Seg1 [1..8] tq may be lengthened temporarily by synchronization Phase_Seg2 [1.. 8] tq may be shortened temporarily by synchronization SJW [1 .. 4] tq may not be longer than either Phase Buffer Segment This table describes the minimum programmable ranges required by the CAN protocol 1 Time Quantum (t q ) Sync_ Prop_Seg Phase_Seg1 Phase_Seg2 Sample Point Nominal CAN Bit Time Seg 1 |
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