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MPC5746C STANDBY mode transition blocked

Question asked by Hang Xie on Jul 24, 2017
Latest reply on Aug 12, 2017 by Hang Xie

In my board, just config the system clock to 160Mhz PLL with 20Mhz XOSC, config PIT[0] to 1ms period, and running freeRTOS with 3 tasks, in one task I want to make the device to STANDBY mode, but the mode transition is blocked at waiting for S_MTRANS to clear.

here are the IMTS and DMTS reg values. Is that any idea to find why the transition is blocked?