STM32W108HB datasheet(87/278 Pages) STMICROELECTRONICS

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STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

General-purpose input/output

Doc ID 16252 Rev 14

87/278

General-purpose input/output

The STM32W108 has 24 multi-purpose GPIO pins that may be individually configured as:

●

General purpose output

●

General purpose open-drain output

●

Alternate output controlled by a peripheral device

●

Alternate open-drain output controlled by a peripheral device

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Analog

●

General purpose input

●

General purpose input with pull-up or pull-down resistor

The basic structure of a single GPIO is illustrated in Figure 9.

Figure 9.

GPIO block diagram

A Schmitt trigger converts the GPIO pin voltage to a digital input value. The digital input

signal is then always routed to the GPIOx_IDR register; to the alternate inputs of associated

peripheral devices; to wake detection logic if wake detection is enabled; and, for certain

pins, to interrupt generation logic. Configuring a pin in analog mode disconnects the digital

input from the pin and applies a high logic level to the input of the Schmitt trigger.

Only one device at a time can control a GPIO output. The output is controlled in normal

output mode by the GPIOx_ODR register and in alternate output mode by a peripheral

device. When in input mode or analog mode, digital output is disabled.

GPIOx_ODR

GPIOx_BSR

GPIOx_WAKER

Alternate output

Analog

functions

Wake detection

Alternate input

VDD_PADS

GND

VDD_PADS

GND

Output control

(push pull ,

open drain , or

disabled )

Schmitt trigger

VDD_PADS

GND

Protection

diode

Protection

diode

P-MOS

N-MOS

GPIOx_CRH/L

GPIOx_IDR

GPIOx_BRR

STM32W108HB 데이터시트(PDF) 87 Page - STMicroelectronics

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