TMS320F28388D: TMS320F28388D-When using 20Mhz Crystal, SCI Baudrate 921600 does not work.

Hello everyone

I am currently using the TMS320F28388D.

I would like to use the speed of SCI at 921600.

The main clock currently in use is using 20Mhz.

System Clock is 200Mhz operation,

LSPCLK operates at 50Mhz with 4 divisions.

At this time, I am trying to operate SCI at baud rate 921600,

When SCI is transmitted to a program such as Teraterm, the data is broken.

The connection connection is as follows.

28388D SCI Port -> ISO7221A (Isolator) -> FT234XD -> USB Port

ISO7221A is using the maximum transmission speed of 1Mbps, but When the corresponding waveform was measured with an oscilloscope, it was confirmed that it came out as normal.

The FT234XD has enough margin at 3Mbps.

Below is SCI's Initialize Code.

 void initSCIAFIFO()
{
     SCI_setConfig(SCIA_BASE, DEVICE_LSPCLK_FREQ, 921600, (SCI_CONFIG_WLEN_8 |
                                                        SCI_CONFIG_STOP_ONE |
                                                        SCI_CONFIG_PAR_NONE));

    SCI_enableModule(SCIA_BASE);
    SCI_resetChannels(SCIA_BASE);
    SCI_enableFIFO(SCIA_BASE);

    SCI_enableInterrupt(SCIA_BASE, (SCI_INT_RXFF | SCI_INT_TXFF));
    SCI_disableInterrupt(SCIA_BASE, SCI_INT_RXERR);


    SCI_setFIFOInterruptLevel(SCIA_BASE, SCI_FIFO_TX2, SCI_FIFO_RX1);
    SCI_performSoftwareReset(SCIA_BASE);

    SCI_resetTxFIFO(SCIA_BASE);
    SCI_resetRxFIFO(SCIA_BASE);

}

Baudrate 921600 calculated by the SCI_setConfig function is

SCIHBAUD = 0;
SCILBAUD = 5;

It comes out with the above value.. Is it correct?,

I think it was initialized normally

The data comes out weird.

Please help

Thanks