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Refering module UCS (Unified Clock System) on module Oscillator MODOSC.

jesus rivera
Prodigy 70 points
Other Parts Discussed in Thread: MSP430F5438A

Refering module UCS (Unified Clock System) on module Oscilllator MODOSC. 

Which is frequency into MODOSC ? 

I don`t understand :

"The ADC12_A may optionally use MODOSC as a clock source for its conversion clock. The user chooses the ADC12OSC as the conversion clock source. During a conversion, the ADC12_A module issues an unconditional request for the ADC12OSC clock source. Upon doing so, the MODOSC source is enabled, if not already enabled from other modules' previous requests. "

I don´t know to use MODOSC,  

Each module contains its module oscillator intern. ADC12OSC 5 mhz.

Thank you

  • 0
    TI__Guru 68116 points

    Hi jesus,

    What MSP430 device are you using?

    The MODOSC actually is the clock source for the ADC12OSC, if you select ADC12OSC in the ADC12_A module. You can find the frequency of MODOSC if you look in the device datasheet. For example, if you were using the MSP430F5438A device, the datasheet is at this link: www.ti.com/lit/gpn/msp430f5438a . On p. 62 footnote 4 on the 12-Bit ADC, Timing Paramters says "(4) The ADC12OSC is sourced directly from MODOSC inside the UCS". It also specifies the frequencies for fADC12OSC in this same table (this is also the frequency of MODOSC because ADC12OSC is sourced from MODOSC).

    So yes, MODOSC = ADC12OSC = ~5MHz, with the specific min/max/typical values being listed in the datasheet for the specific device that you are using.

    Regards,

    Katie

  • 0
    Guru 227245 points
    I understand that the 'appearance' of MODOSC is a bit confusing. It is part of the UCS but is not configurable in any way. And only available to few modules like the ADC. IIRC, the flash controller also uses MODOSC as timebase.

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