Final answer:
To control a servo motor with a microcontroller, a Pulse Width Modulation (PWM) pin is essential as it allows for precise control by varying the duration of pulses, directly influencing the servo's position.
Step-by-step explanation:
When selecting a microcontroller for controlling a servo motor, the key feature to include is a Pulse Width Modulation (PWM) pin. PWM allows for fine control over the servo's position by varying the duration of the pulse within a fixed time frame. This modulation controls the angle to which the servo arm moves. Hence, for a servo motor operation, a PWM output is essential. Therefore, among the options provided, the correct choice would be:
- D. Pulse Width Modulation pin
Servo motors do not operate with analog or digital signals directly controlling their position; they require a PWM signal to set the desired position. The microcontroller must be able to generate a PWM signal of the correct frequency and duty cycle to interface effectively with the servo motor.