NUC029-FAN datasheet(39/70 Pages) NUVOTON

39 / 70 page

NUC029xDE

Dec 18, 2018

Page 39 of 70

Rev 1.01

6.5 General Purpose I/O (GPIO)

6.5.1 Overview

The NuMicro

NUC029LDE/NUC029SDE series has up to 56 General Purpose I/O pins to be

shared with other function pins depending on the chip configuration. These 56 pins are arranged

in 6 ports named as GPIOA, GPIOB, GPIOC, GPIOD, GPIOE and GPIOF. The GPIOA/B port has

the maximum of 16 pins. The GPIOC port has the maximum of 12 pins. The GPIOD port has the

maximum of 4 pins. The GPIOE port has the maximum of 1 pin. The GPIOF port has the

maximum of 7 pins. Each of the 56 pins is independent and has the corresponding register bits to

control the pin mode function and data.

The I/O type of each of I/O pins can be configured by software individually as input, output, open-

drain or Quasi-bidirectional mode. After reset, the I/O mode of all pins are depending on

Config0[10] setting. In Quasi-bidirectional mode, I/O pin has a very weak individual pull-up

resistor which is about 110~300 K

 for V

DD from 5.0 V to 2.5 V.

6.5.2 Features



Four I/O modes:

Quasi-bidirectional

Push-Pull output

Open-Drain output

Input only with high impendence



TTL/Schmitt trigger input selectable by GPx_TYPE[15:0] in GPx_MFP[31:16]



I/O pin configured as interrupt source with edge/level setting



Configurable default I/O mode of all pins after reset by Config0[10] setting

If Config[10] is 0, all GPIO pins in input tri-state mode after chip reset

If Config[10] is 1, all GPIO pins in Quasi-bidirectional mode after chip reset



I/O pin internal pull-up resistor enabled only in Quasi-bidirectional I/O mode



Enabling the pin interrupt function will also enable the pin wake-up function

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