Part Number: MSP430FR6989
Tool/software:
Team, Could you please help with the below?
As part of some resilience testing for the MSPP430 clock source:
The MSP430FR6989 switches to the internal 32kHz clock when there is a resistance of less than 300kOhm in parallel with the chip input-side load capacitor (C105) and no longer uses the externally provided clock. Unfortunately, the internal clock is relatively imprecise. Also the MCU draws a fairly high current of about 150uA in this state.
We would like to understand this behavior better.
-What criteria does the MSP use to decide whether to use the internal clock?
-Is it a documented behavior? WHere can we find the related doc?
Thanks in advance,
Also I am listing the different MSP430 App note about crystal/oscillator.
Are they all valid for FR698x also?
How to Achieve Higher Accuracy Timer with Internal Oscillator on MSP430 - https://www.ti.com/lit/pdf/slaae38
MSP430 LFXT1 Oscillator Accuracy https://www.ti.com/lit/pdf/slaa225
MSP430 32-kHz Crystal Oscillators - https://www.ti.com/lit/pdf/slaa322
Crystal Recommendations For TI MSP430 Microcontrollers - https://www.ti.com/lit/pdf/slaa367
Or is the FR6989 datasheet/User's guide a better source of information on this matter?
Thanks
Anthony
