AN2577

System design

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Note:

Asserting HOLD will always subtract exactly one tooth from the TCR2 angle count. The

correction is made by stopping the count, and the angle count does not decrement or repeat

any count.

3.5

Tooth circuit failure

If the tooth circuit fails and the failure is detected by the host, the software may implement a

limp home strategy. The eTPU angle clock provides a method to disconnect the angle clock

system from the Channel 0 input so that spurious signals from the tooth circuit will not

disrupt the limp home system. In that event, the host may configure the eTPU such that

Channel 0 continues to monitor the tooth circuit for diagnostic purpose. See the Reference

Manual for details.