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MSP430F5529, How to set baudrate to 9600bps at 8MHz?

Rui Zhu
Prodigy 50 points


I successfully set baudrate to 9600bps at 1MHz （SMCLK） by either of the following configurations without knowing what they exactly mean, especially the MCTL register:

UCA0BR0 = 6;
UCA0BR1 = 0; 
UCA0MCTL = UCBRS_0 + UCBRF_13 + UCOS16;

// UCA0BR0 = 0x68;
// UCA0BR1 = 0x00;
// UCA0MCTL = 0x04; 

However, when I change SMCLK to 8MHz, I couldn't figure out what should be the settings. I tried a couple online calculator but the values won't work for me.

Any suggestions on the values, or better yet, an explanation of what they represent, would be very much appreciated.

Thanks.

  • 0
    Guru 74080 points

    Rui,


    look at the user's guide:

    On page 993 there is a table with commonly used baudrates. You do not even have to do the calculations yourself - TI has already done this for you. For a BRCLK of 8MHz and a transmission speed of 9600 baud you have to

    • Set UCOS16
    • Set UCBR to 52
    • Set UCBRF to 1
    • Set UCBRS to 0x49

    This will give you a maximum error of +0.14 % at receiving which isn't much at all.

    Dennis

  • 0
    Guru 34773 points

    Rui Zhu said:

    However, when I change SMCLK to 8MHz, I couldn't figure out what should be the settings. I tried a couple online calculator but the values won't work for me.


    You tried also this one?

    forum.43oh.com/.../2640-uart-configurator

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