7.5 Digital I/O Pin Behavior During Power-up Sequences

The following table represents digital I/O pin states corresponding to device power modes.

Table 7-3. Digital I/O Pin Behavior in Different Device States
Device stateVDDIOCHIP_ENRESETNOutput
driverInput
driverPull up/down resistor (96kΩ)
Power-Down:
core supply offHighLowLowDisabled (Hi-Z)DisabledDisabled
Power-on Reset:
core supply on, hard reset onHighHighLowDisabled (Hi-Z)DisabledEnabled
Power-On Default:

core supply on, the device is out of reset but not programmed yet

HighHighHighDisabled (Hi-Z)EnabledEnabled
On Sleep/
On Transmit/
On Receive:
core supply on, device
programmed by firmwareHighHighHighProgrammed by firmware for each pin:
Enabled or DisabledOpposite of Output Driver stateProgrammed by firmware for each pin:
Enabled or
 Disabled