具体你可以查看参考手册：131页以及156页。
On-chip voltage regulator is in a low-power mode that supplies only
enough power to run the chip at a reduced frequency. Only MCG
modes BLPI and BLPE can be used in VLPR.
• Reduced frequency Flash access mode (1 MHz)
• LVD off
• In BLPI clock mode, only the fast internal reference oscillator is
available to provide a low power nominal 4 MHz source for the
core with the nominal bus and flash clock required to be <800
kHz
• Alternatively, BLPE clock mode can be used with an external
clock or the crystal oscillator providing the clock source.
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