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MPC5746C fails to enter STANDBY mode

Question asked by Hu Sheng on Aug 12, 2019
Latest reply on Aug 13, 2019 by Lukas Zadrapa

I found that the MPC5746C fails to enter STANDBY mode while the WKPU registers of a wakeup pad are configured as follows:

1) WKPU_WISR, WKPU_WRER, WKPU_WIREER, WKPU_WIFFER of the wakeup pad is set to '0'

2) WKPU_WIPER of the wakeup pad is set to '1'

3) Please notice that this wakeup pad is a FLEXCAN RXD pad, and before the mode transition request, no Rx or Tx interrupt was generated 

4) I am sure that there is no interrupt and wakeup event of other wakeup pads

 

However, I tried to set WKPU_WIPER of the wakeup pad  to '0' , and other conditions keep the same as above, it enters STANDBY mode normally.

 

I want to know why the configuraion of WKPU_WIPER have a influence on the mode entry process. 

 

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