Yes, several device pins act as configuration pins during power on reset (POR). This switching between normal function and POR function of the pin is done automatically - during POR period internal output driver is disabled (switched to high impedance mode), and pin becomes input pin, the state of this input pin is internally sampled and used as POR configuration value.
According to device datasheet, Section 3.9, most of the configuration pins have internal on-chip pull-up resistor of approx 20 Kohm value, so if you wish to pull this pin up, this internal pull-up may be enough. If you wish to pull this pin down, datasheet states 4.7Kohm pull-down resistor will be enough to overpower internal weak pull-up.
Note that this depends on external load. If you have heavy external load connected to POR pin, internal weak pull-up may be not enough to create logic "high" state during POR configuration. In this case you may add external pull-up to be sure.
When the device comes out from reset, and appropriate pins become outputs and actively driven, these externally connected pull-ups/pull-downs should not significantly affect output driving capability of the device pins, because 4.7K is approx 100 times less than typical output impedance of the output driver.
Have a great day,
Alexander
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