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TMS320F28069: eCAN 发送耗时问题

Part Number: TMS320F28069

一般一个CAN 帧发出去要耗时多少?

我看例程里面都是检测这个寄存器的Bit 位来判断发送是否完成:ECanaRegs.CANTA.all,

我按照28069 90M 时钟来看,一般要900 个周期才能完成一次发送? 也就是要10+us,大约是这个量级吗?