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two STM32 micro USART communication

Question asked by xu.jianchun on Feb 14, 2015
Latest reply on Feb 16, 2015 by Clive One
In my design, I am using two STM32 micro communicate with USART, the connection is as below, these two micro is in same board, and the communicate trace line length is around 1.5 inch.
STM32F030 (USART1_TX)  PA9------STM32F205(USART3_RX) PB11
STM32F030 (USART1_RX)  PA10-----STM32F205(USART3_TX) PB10
I am just directly connected as above,
my question is :
1, Does I need to an outside pull up on both connections, if needed, the micro internal 40k ohm pull up is enough or not ?
2, Does I need to put two serial resistorS on these connections ? if no, is there any reliability issues ?

Thanks.

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