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The default settings for a blank Field programmable device shipped by the factory are all bits set to 0, all outputs tristated, and the crystal oscillator circuit active unless the devices are programmed by your distributor as per your default needs that you will let him know. While using I2C for serial programming such a blank device, unused registers should be left alone. Programming them all to 0's could cause unwanted behavior depending on which register it is. The OscCap value should be set to  to have the least amount of capacitance when an external driven reference is used.