Depending on the NuMicro® Family series, there is a different default state of the GPIO for selection. Users can select the default state of a GPIO by setting the CIOINI(Config0[10]).

The following table lists the settings of CIOINI for each NuMicro® Family series:

NuMicro® Family Series	CIOINI = 1 (Default)	CIOINI = 0
Mini51 Series	Input tri-state	Quasi bi-direction
Mini58 Series	Input tri-state	Quasi bi-direction
M051 Series	Quasi bi-direction	Input tri-state
M0518 Series	Quasi bi-direction	Input tri-state
NUC100/120 Series	Quasi bi-direction	Input tri-state
NUC130/140 Series	Quasi bi-direction
NUC122 Series	Quasi bi-direction
NUC123 Series	Quasi bi-direction
NUC131 Series	Quasi bi-direction	Input tri-state
NUC200/220 Series	Quasi bi-direction	Input tri-state
NUC230/240 Series	Quasi bi-direction	Input tri-state
Nano100 Series	Input tri-state
Nano1x2 Series	Input tri-state
NUC442/472 Series	Input tri-state	Quasi bi-direction
M451 Series	Input tri-state	Quasi bi-direction
NUC505 Series	Input tri-state

Products:	마이크로컨트롤러(MCU) ,Arm Cortex-M0 MCUs ,M051 시리즈 ,M0518 시리즈 ,M0519 시리즈 ,Mini51 시리즈 ,Nano100/102 시리즈 ,Nano110/112 LCD 시리즈 ,Nano120 USB 시리즈 ,Nano130 어드밴스드 시리즈 ,NUC029 시리즈 ,NUC100/200 어드밴스드 시리즈 ,NUC120/122/123/220 USB 시리즈 ,NUC130/230 CAN 시리즈 ,NUC131/NUC1311 CAN 시리즈 ,NUC140/240 연결(Connectivity) 시리즈 ,Arm Cortex-M4 MCUs ,M451 시리즈 ,M451M 시리즈 ,M452 USB 시리즈 ,M453 CAN 시리즈 ,NUC442/472 시리즈 ,NUC505 시리즈
Applications:
Function:	Peripherals,I/O,GPIO

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What is the default state of the general purpose I/O (GPIO)? Issue Date：2015-07-17

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