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UART is not working properly at lower frequency

Question asked by V.D on Oct 25, 2016
Latest reply on Nov 1, 2016 by Clive One
Hi,

I am using STM32F4xx MCU in our product and there is a GSM module connected over UART2 of MCU.

Initially MCU was configured to operate at 168MHz frequency and UART2 was configured for 38400 baud rate. At that time everything works fine. But not to reduce power consumption I am trying to reduce the System Clock, and thus PCLK1/2, to 16/32MHz and UART2 at same baud rate i.e. 38400. But it is missing few data sent by the GSM and that is why the GSM is not woking. I have also tried with 9600 baud rate, but still issue persist.

Do I need to change any configuration for UART? Please help.

Thanks,
Dhaval

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