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SPC5742P system to fail when the power is down below 3.1V

Question asked by Darcy Xu on Jul 7, 2019
Latest reply on Jul 8, 2019 by Peter Vlna

When the power supply voltage of the MPC5742P gradually decreases from 3.3V to around 3.1V, the MPC5742P will continuously reset itself (detect the reset pin through the oscilloscope); When the power supply voltage of the MPC5742P is raised to the normal supply voltage of 3.3V,the C55FMC.MCR register (address 0xFFFE0000) is modified when the clock initialization MC_MODE_INIT function is executed. For details, see the attached picture (execution MC_ME.MCTL.R=0x3000A50; after) .
Abnormal modification of the C55FMC.MCR register will cause the DFLASH (C55 Flash) function to execute abnormally, which may cause the system to fail.

 

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