I assume it is not a PWM | Microcontroller › 8051 › unable to differ between pwm and continious input through 74HC165 for dotmatrix display › I assume it is not a PWM July 26, 2016 at 9:45 am #14081 Prabakaran P MParticipant I assume it is not a PWM signal. It may me acting as a pulse for shifting the LEDs in the dot matrix to create a scrolling effect. Imagine a shift register to create a scrolling effect.
