I want to use uart function on STM32l151. It is ok when MCU run in normal mode. When I set configUSE_TICKLESS_IDLE is 1. The uart can’t send the correct data to pc terminal. I use oscilloscope to check uart data timing. If it is normal, the timing is ok. If it is wrong, the time is 1.5 times as long as the normal time. How do I check low power mode process?