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Can i use an IO pin to communicate using SCI at 5 baud

Question asked by juturu praneeth on Feb 26, 2009
Latest reply on Feb 26, 2009 by David Payne

I want to transmit 0x33h from the MC9S12XDT512 microcontroller using SCI to an automobile for communication initiation. (communication is half duplex) Immediately after transmitting the  above said value,  SCI  baud rate has to be changed to  10.4kbaud 


Inorder to achieve the above said

Can i use an IO pin and a timer to transmit UART data 0x33h at 5 Baud (ie 1 start bit, 8 bits , 1 stop bit => 10 bits total ie 2000 milliseconds 1 bit has to be transmitted) start bit is low and stop bit is high in UART. 

Then on can i program SCI baud registers to 10.4 kbaud and continue the communication.

Will this work?

Am i correct ?

Can you through more light on the above said requirement. 


When we consider baud rate , is it including the start and the stop bits or not.

Do we have to give same duration of time for both data and (start & stop) bits