How about the UART transmit delay from INTID register set to real physical signal transmit finish?

Hi all,

One of customer want to use UART Interrupt Identification Register (IIR)  INTID register to judge if UART transmit was finished. And they will use this to change 485 transmit direction.

But I want to know, if there is a delay between INTID resiger status change with real signal transmit finish? If yes, how about the delay?

thanks!

BR,
Denny