MSP430FR5872: WATCHDOG

Himanshu Khanna

Intellectual 340 points

Part Number: MSP430FR5872

Hi Expert.

In mostly MSP430 example code I am seeing this line in starting of the main loop "WDTCTL = WDTPW | WDTHOLD;

Can you explain the reason behind this and if we exclude this statement then what could be the consequences?

Thanks In Advance

over 8 years ago

0 Mike Tooma over 8 years ago

Genius 3255 points

By default, the watch dog timer is enabled.
A watchdog timer is basically a timer that counts to a certain limit, and when that limit is reached (when the timer overflows), it resets the MCU.

So, that line of code disables the watchdog timer. If you exclude it (and if you do not periodically reset the watchdog timer within your firmware), the watchdog timer will reset the MCU once it overflows.

0 Winter Yu over 8 years ago in reply to Mike Tooma

TI__Genius 12315 points

Hi ,

Thanks for your answer. It's correct!

Best Regards,

If my post helped solve your issue, please click on the VERIFY ANSWER button.

Winter,

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0 Himanshu Khanna over 8 years ago in reply to Mike Tooma

Intellectual 340 points

Hi,

Thanks for your answer. Can you tell approx time before which we have to reset watchdog? or I mean to say that what is the duration for watchdog timeout.?

0 Winter Yu over 8 years ago in reply to Himanshu Khanna

TI__Genius 12315 points

Hi Himanshu,

You can find the description in Section 24.1 in MSP430FR58xx, MSP430FR59xx, and MSP430FR6xx Family User's Guide (Rev. O).

Best Regards,

If my post helped solve your issue, please click on the VERIFY ANSWER button.

Winter,

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MSP430FR5872: WATCHDOG