When a stable power is applied to the CC3220x chip for the first time or when supply voltage is restored to the proper value following a period with supply voltage less than 1.5 V, the level of each digital pad is undefined in the period starting from the release of nRESET and until DIG_DCDC powers up. This period is less than approximately 10 ms. During this period, pads can be internally pulled weakly in either direction. If a certain set of pins is required to have a definite value during this prereset period, an appropriate pullup or pulldown resistor must be used at the board level. The recommended value of this external pull is 2.7 kΩ.