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USART SmartCard Clock

Question asked by oj.rasmin on Sep 13, 2011
Latest reply on Sep 14, 2011 by Clive One
I am using STM32F107VC with system clock set to 72MHz. I want to set USART3 clock to 4MHz in smart card mode without changing APB1 clock (which is 36 MHz, and all software relied on this value). I have to use USART3 because smart card ic rooted to mcu pins which can only be USART3 in pcb. 

thanks in advance.