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STM32F401RE - Size of TDR buffer in USART peripheral

Question asked by Dimitris Paraskevopoulos on Sep 3, 2016
Latest reply on Sep 3, 2016 by Clive One
Hi all,

I was looking at the reference manual for the USART peripheral and I saw that there are two buffers TDR & RDR (Transmit and Receive Data Register) between USART_DR (Data Register) and their respective Shift registers.

I looked around but I couldn't find any information on this buffer.

Can someone please enlighten me?