nRF52840 RESETn pin configuration

When P0.18 is configured as the RESETn pin, is there a pull-up enabled?

In our design we have an external CPU driving the nRF52 RESETn line.

We have a pull-down on that line (10k)  and we are seeing 1.3V with a VCC of 3.3V when our CPU has that line tri-stated.

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