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Topic: Watchdog oscillator frequency (Read 549 times) previous topic - next topic

Jack Christensen

Was just reviewing the watchdog timer in the datasheet for the ATmega328P, and while it's nominally advertised as having a 128KHz clock, from the chart below it seems that the design point is around 10% slower than that. Might this represent some sort of safety factor to allow slightly "late" watchdog resets to squeak through?

tim7

The accuracy of the 8MHz RC oscillator is rated as +/-10%.  If the same applies to the Watchdog oscillator, then it might be that the design frequency is chosen so that the real frequency never (or rarely) exceeds 128kHz.

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