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Low Buad Rate Issue

Guru 20075 points

Hello,

I am not successful in get the TM320F28335 SCI modules to receive data properly at the baud following baud rates: 1200,9600 or 2400.  I have Low Speed Clock  set at 18.75Mhz ( XCLKIN = 30MHz, SysCtrlRegs.LOSPCP.all = 4, SysCtrlRegs.PLLSTS.bit.DIVSEL = 2) and the BRR as follows for each baud rate:

1200, BRR = 1952

2400, BRR = 976

9600, BRR = 243

What strange is that both 19.2KBaud (BRR=121) and 38.4KBaud work (BRR = 60).

Does anyone have any idea why the high baud rates are working and not the low baud rate? 

Stephen