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.