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Doubt and suggestion required regarding MSP430F5131

chandra mouli
Prodigy 110 points
Other Parts Discussed in Thread: MSP430F5131

 

Hi,

Iam planning to use the MSP430F5131. Iam using the external interrupt (ZCD) to 

trigger a counter and find out how many clock pulses are there in the ZCD input. Its like

measuring the time period of the waveform (Iam assuming 50% duty cycle).

 

My Doubt is what is the maximum frequency (or the min time period)  that i can generate inside the

MCU so that i get a lot of pulses. The MCU clock frequency is 25MHz. The time period is 40nS.

Do i have the option of going less than this (if so how much).  Can i use any frequency multiplier

to get the counter run at a high frequency (> 25MHz).

 

Any suggestion to point me in the right direction is highly appreciated.

 

Regards

Shasthri

 

 

  • TI__Guru 73416 points

    Hi,

    The F5131 has a Timer_D module, which is our new high resolution timer module. This module includes a high resolution mode where the timer frequency can be set to a multiple of one of your clock sources - this will allow you to measure your high frequency (~25MHz I'm guessing?) signal more precisely by making one period contain more timer counts. For more information you will want to see the Timer_D section of the User's Guide (Ch. 16 on p. 399) and the code examples for this device.

    Regards,

    Katie

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