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MSP430FR6972: Timer deviation

Part Number: MSP430FR6972

Hi,

Good day.

Our customer has an inquiry about the MSP430FR6972. Kindly see below.

""I hope to use timer to send data every 1 minute, but the receive time is always 3 ~ 4ms fast.
The specific configuration is as follows:
1) Chip, msp430fr6972
2) Timer, external crystal oscillator 32768Hz , division coef 64 , timeout count 512, continuous mode.

(see file attached)
MSP430FR6972.zip

""

Looking forward to your inputs.


Regards,

Cedrick

  • My calculator says that 3ms/60sec=.000050 i.e. 50ppm, which is the right order of magnitude for the accuracy of a 32kHz crystal.

    There may also be some rounding error in there, since 32kHz can't count exactly 1ms. Are you certain CCR0 is always incremented by 512?