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Why is the IrDA Baudrate limited to 115.2kBd?

Question asked by bil.til on May 13, 2013
Latest reply on May 14, 2013 by Clive One
Hi, in STM32F4 RM 26.3.12 it says, that "USART supports only bit rates up to 115.2kBps for the SIR ENDEC". Can anyone tell me the reason? (115.2kBd must be an increibly low data rate for a 168MHz processor).

In fact I tried the USART_Printf example in STM32F4xx_DSP_StdPeriph_Lib_V1.0.0 and enabled IrDA there, and it was no problem at all to increase the baudrate to 1MBd, the chip created nice 3/16 output pulses as expected.

I did not try yet the reception part neither the IrDA transmitter. But as now there are IrDA transceivers available until 4MBd and even 16 MBd, I would expect that there is problem on the transceiver side?

So did any other guys here perhaps already try to use IrDA at some higher baudrate than 115 kBd and could possibly share their experiences?