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CC2340R5: Provision to change MCU and peripheral frequency through SYSConfig GUI.

Selvam Krishnan
Prodigy 220 points
Part Number: CC2340R5
Other Parts Discussed in Thread: SYSCONFIG

Good day TI team,

For CC2340R5 example, 

Please guide to change the MCU and peripheral frequencythrough sysconfig GUI.

Apart from this, if we have any other method, please share the same too.

 

Thanks

Selvam

  • 0
    TI__Expert 6480 points

    Hi Selvam !

    What exactly do you mean by changing the peripheral frequency, which peripheral are you referring to ?

    If you are trying to create a clock/timer using the CC2340R5, you can follow the chapter on clockP of the user guide.

    Kind regards,
    Lea

  • 0
    Prodigy 220 points

    Good day Lea,

    Thanks for the response and sorry for the late reply.

    We would like to avoid external crystals and change MCU operating frequency first.

    in sysconfig GUI, it looks not able to find the option to change the MCU frequency to 1MHz for consuming less current of less than 

    Able to options of LFXOSC and LFRCOSC 

    We selected LFRCOSC as below. (Hope able to see picture)

    ...

    Please suggest option to change the MCU frequency

    Thanks

    Selvam

  • 0 in reply to Selvam Krishnan
    TI__Expert 6480 points

    Hi !

    It is not possible to lower the operating frequency of the CC2340R53 through SysConfig, or through software. Lowering the operating frequency of the CC2340R53 MCU is not something that the chip supports officially, and no tests are conducted by TI to ensure that a lower operating frequency would work.

    You could try to use a external crystal, but I would not advise this at all, as you may face many unforeseen issues with your wireless connections due to timing issues. For example, the BLE specification is pretty strict on what the clock drift can be, and some devices may timeout due to differences in timing for the packets.

    If you are concerned about power usage, know that the CC2340R53 uses a power driver that automatically puts the device into a low power state when idle. I would expect the power consumption of the 1 MHz operating frequency MCU to be very close to the 48 MHz one, because while idle the MCU will consume very low energy (about 0.71 ua in standby according to the TRM). You can read more about the power driver here.

    Kind regards,
    Lea

  • 0 in reply to Lea
    Prodigy 220 points

    Hi Lea,

    Thanks for the clarity. 

    One more basic clarification, Will external 48MHz crystal reduce the current consumption?

    Thanks

    Selvam