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A KL25Z GPIO output is used to turn a LED on and off. The cathode of the LED connects to ground and the anode connects to the uC pin through a current limiting resistor. What is the value written to the corresponding bit in the GPIO output register to turn on the LED? Wrong GPIO register is specified A TPM peripheral using PWM is needed, not GPIO 1

A KL25Z GPIO output is used to turn a LED on and off. The cathode of the LED connects to ground and the anode connects to the uC pin through a current limiting resistor. What is the value written to the corresponding bit in the GPIO output register to turn on the LED? Wrong GPIO register is specified A TPM peripheral using PWM is needed, not GPIO 1

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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**Question:** A KL25Z GPIO output is used to turn an LED on and off. The cathode of the LED connects to ground, and the anode connects to the microcontroller (uC) pin through a current limiting resistor. What is the value written to the corresponding bit in the GPIO output register to turn on the LED? **Options:** - ○ 0 - ○ Wrong GPIO register is specified - ○ A TPM peripheral using PWM is needed, not GPIO - ○ 1
Transcribed Image Text:**Question:** A KL25Z GPIO output is used to turn an LED on and off. The cathode of the LED connects to ground, and the anode connects to the microcontroller (uC) pin through a current limiting resistor. What is the value written to the corresponding bit in the GPIO output register to turn on the LED? **Options:** - ○ 0 - ○ Wrong GPIO register is specified - ○ A TPM peripheral using PWM is needed, not GPIO - ○ 1
Expert Solution
Explanation

1) LEDs have a positive and negative terminal know as the anode and cathode.

2) The cathode of LED is connected to the ground.

3) The anode of LED is connected to the uC pin through current limiting register.

4) When the voltage at the uC pin is high the LED gets into forward bias condition and the LED turns ON

5) When the voltage at the uC pin is low the LED gets into reverse bias condition and the LED turns OFF

6) So we need to write value 1 to the corresponding bit of in the GPIO output register to turn on the LED

 

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