Câu hỏi về GPIO

What can GPIO be used for?

• Read digital signals

• Generate activation signals for external components

• Trigger interrupts

• All of the above

Which function does not belong to GPIO?

• Activate the microcontroller

• Control the LCD screen via I2C

• Read digital signals from sensors

• Detect interrupt events

Which component of GPIO is responsible for storing input signals from GPIO pins?

• ODR (Output Data Register)

• MODER (Mode Register)

• IDR (Input Data Register)

• AFR (Alternate Function Register)

In STM32, which register determines the operating mode of GPIO pins (Input, Output, Analog, Alternate Function)?

• OSPEEDR

• MODER

• PUPDR

• OTYPER

What will happen if a GPIO pin is configured in 'Open-Drain' mode without an external or internal pull-up resistor?

• The GPIO pin will always be high (HIGH).

• The GPIO pin will always be low (LOW).

• The GPIO pin may be 'floating' (undefined state).

• The GPIO pin will not function.

Which of the following statements about the function of GPIO in MCU is incorrect?

• GPIO can generate activation signals for external peripherals.

• GPIO can be used to read analog signals directly.

• GPIO can be configured to trigger external interrupts (EXTI).

• GPIO can be used to wake the microcontroller from sleep mode.

Why are some pins on the MCU not called GPIO?

• Because they cannot be used for multiple purposes.

• Because they are always in OUTPUT mode.

• Because they can only generate interrupt signals.

• Because they do not belong to the MCU.

When a GPIO pin of the MCU is in INPUT mode, which capability may it have?

• Generate an interrupt signal to the processor.

• Only receive signals without any other effect.

• Switch to OUTPUT mode immediately.

• Completely turn off and not operate.

How many ports does the VDK STM32F401RE have?

What is the RCC_CR register used for?

• Configure clock signal control

• Configure and select clock signal sources

• Provide clock signals to GPIOs

• Select clock signal sources