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MSP430 RTC CRYSTAL

FAB63476
Intellectual 530 points

Hi We have a product that has an 32768 Hz Crystal for RTC operations, and for communication purposes. The maximum allowable BaudRate using the crystal is 9600 bps, and we would like to extend this baudrate to the double. Is the MSP430 capable of working with a 65535 Hz Crystal maintaining the stability and being able to use the rtd and the uart ? Do you see any drawback in doing this ? I 've been looking for this data within the datasheet and I could find it. Thanks in advance.

  • 0
    Expert 2080 points

    One thing to know is: "If it is not explicitely written on the datasheet it will not work"

    The LFXT1 is made for working with 32kHz crystal and no other, but all MSP430 contains an internal digitally controlled oscillator (DCO or FLL on certain devices) which could be used to clock the UART (SMCLK) to have a higher baudrate, you could probably use this frequency depending on your power requirements.

    If I remenber correctly the UART module automatically enable and disable the DCO if the SMCLK is configured, the power consumption in LPM3 with DCO activated at 1Mhz (which is LPM0 in fact) is around 100uA, but only while communicating.

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