What Is CNT ARR CCR for PWM?
What Is CNT ARR CCR for PWM
CNT, ARR, and CCR are three important parameters that are used in pulse width modulation (PWM) to control the duty cycle and frequency of a digital signal. These parameters are typically used in electronic devices such as microcontrollers and motor drivers to control the speed and direction of motors, dim lights, and regulate the power output of a device.
PWM is a technique that is used to encode a digital signal with variable duty cycles. This is done by rapidly switching a digital signal on and off at a specific frequency, with the ratio of on time to off time determining the duty cycle of the signal. The duty cycle is typically expressed as a percentage, with a duty cycle of 50% indicating that the signal is on for half the time and off for the other half.
CNT is the counter that is used to count the number of pulses in a PWM signal. The value of the CNT parameter determines the frequency of the PWM signal, with a higher value resulting in a lower frequency and a lower value resulting in a higher frequency.
ARR is the auto-reload register, which specifies the value that the CNT parameter resets to after each pulse. The value of the ARR parameter determines the maximum value of the CNT parameter, and therefore also determines the maximum frequency of the PWM signal.
CCR is the compare register, which specifies the value at which the output of the PWM signal changes. When the value of the CNT parameter reaches the value of the CCR parameter, the output of the PWM signal changes from high to low (or vice versa, depending on the configuration of the signal). The value of the CCR parameter therefore determines the duty cycle of the PWM signal.
In summary, CNT, ARR, and CCR are three important parameters in PWM that are used to control the frequency and duty cycle of a digital signal. These parameters are often used in microcontrollers and motor drivers to control the speed and direction of motors, dim lights, and regulate the power output of a device.