STM32W108CBU6 STMICROELECTRONICS [STMicroelectronics], STM32W108CBU6 Datasheet - Page 46

• Manufacturer Part Number: STM32W108CBU6
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

General-purpose input/outputs
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General-purpose input/outputs
The STM32W108 has 24 multi-purpose GPIO pins that may be individually configured as:
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The basic structure of a single GPIO is illustrated in
Figure 8.
A Schmitt trigger converts the GPIO pin voltage to a digital input value. The digital input
signal is then always routed to the GPIO_PxIN 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 GPIO_PxOUT register and in alternate output mode by a peripheral
device. When in input mode or analog mode, digital output is disabled.
Functional description
GPIO ports
The 24 GPIO pins are grouped into three ports: PA, PB, and PC. Individual GPIOs within a
port are numbered 0 to 7 according to their bit positions within the GPIO registers.
General purpose output
General purpose open-drain output
Alternate output controlled by a peripheral device
Alternate open-drain output controlled by a peripheral device
Analog
General purpose input
General purpose input with pull-up or pull-down resistor
GPIO block diagram
Doc ID 16252 Rev 2
Figure
STM32W108CB, STM32W108HB
8.