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TMS320F280039C: MCAN模块的bus-off问题咨询

Part Number: TMS320F280039C

  CAN标准协议应该是错误计数器达到255才会认为进入bus-off状态。但我在测试时发现错误计数器的值为248时,bus-off标志位就置位了。请问280039的判断标准是有所不同吗?