MSP430FR5969: Device is rebooting itself

Hi Sachin,

The first thing I would investigate is the SYSRSTIV register. When the device resets, this register generates a value that can be used to identify the cause of reset.

Also, when a device is resetting, be sure to probe VCC when the problem occurs to rule out any supply issues.

Best regards,
Caleb Overbay

Hi Caleb thanks for the replay..

I am trying to read that register for more clarity. When i read the watchdog manual there is values for different divider select, i am not understanding its calculation. It is something like this, 

000b = Watchdog clock source /(2 31 ) (18h:12m:16s at 32.768 kHz)
001b = Watchdog clock source /(2 27 ) (01h:08m:16s at 32.768 kHz)
010b = Watchdog clock source /(2 23 ) (00h:04m:16s at 32.768 kHz)
011b = Watchdog clock source /(2 19 ) (00h:00m:16s at 32.768 kHz)
100b = Watchdog clock source /(2 15 ) (1 s at 32.768 kHz)
101b = Watchdog clock source /(2 13 ) (250 ms at 32.768 kHz)
110b = Watchdog clock source /(2 9 ) (15.625 ms at 32.768 kHz)
111b = Watchdog clock source /(2 6 ) (1.95 ms at 32.768 kHz)

how we can achieve the timings 18:12:16 and so on.. 

Let's take the value for 100b - it is 250ms timeout when the watchdog is sourced with a clock frequency of 32.768kHz.

It is calculated like this:

1s is 32,768 clock cycles

A divider of 2^13 means a divider of 8,192.

This means that the reset occurs after 8,192 clock cycles which is 250ms because it is 1/4 of 32,768.

So simply divide 1s / (32,768 / 2^n) which is the same as (32,768 / 2^n)^-1 or 2^n / 32,768

For 000b this is

2,147,483,648 / 32,768 = 65,536s

and 65,536s are 18h, 12m and 16s

Hi Sachin,

Do you still need help with this issue or did you find a solution you'd like to share?

Best regards,
Caleb Overbay

Thank you all

Hi ,

Issue was with RTC interrupt, in code there was soft reboot in RTC interrupt. I put logic for saving the logs wherever soft reboot is happening, finally found and fixed.