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TMS320F28377D-EP: WatchDog reset timing a bit off, not what is expected

Part Number: TMS320F28377D-EP
Other Parts Discussed in Thread: TMDSCNCD28379D


I am working on setting up the WD and I noticed the reset time value using a scope plugged on the XRSn pin is not what I expected.

After enabling the WD with a presale of 1 (WDPS = 0, WDCLK = INTOSC1/512/1), I am expecting to have a time between each continuous WD reset around 13.1ms with INTOSC1 = 10 MHz.

1/(10MHz/512) * 256 (WDCR) = 13.1ms.

I measure around 19ms (see below):

Then, when I measure the time of the XRSn, I am expecting to get 512 x INTOSC1 = 51.2us (per the datasheet) but I measure around 60us (see below):

Does anyone know what is going on?

Thank you.