I modified the example of Standby and added the PLL program.
The test findings are as follows:
1 the first power on the chip, the chip can normally enter the Standby mode, the current is normal.
2 MPC5748G can use the WKUP12 PIN to wake up to normally run. But the current will be larger when it comes to the Standby mode again. At this time the external oscillator is closed, but the core voltage is not closed.
3 STM wake-up is invalid if PLL is used, but it is normal when PLL is not used.