MICROCONTROLLER CIRCUIT, CORRESPONDING DEVICE, SYSTEM AND METHOD OF OPERATION

A circuit (106) comprises a first (24a) and a second (24b) memory, a processing unit (21) and a timer (22). The processing unit generates a sequence of bits encoding a CAN frame and processes the sequence of bits to detect a sequence of PWM periods. Each PWM period has a dominant portion and a recessive portion, and a total duration. The processing unit stores values of a first parameter of the PWM periods into the first memory, and values of a second parameter of the PWM periods into the second memory, wherein the first and second parameter define a shape of the PWM periods. The timer comprises a first register (220) which reads from the first memory a value of the first parameter of a current PWM period. The timer comprises a counter (221) which increases a count number and resets the count number as a function of the value of the first register. A value of the first parameter of a subsequent PWM period is stored into the first register as a function of the value of the first register. The timer comprises a second register (222) which reads from the second memory a value of the second parameter of the current PWM period, and compares the count number of the counter circuit to such value. The second register drives an output pin (230) to a dominant (resp., recessive) value as a function of said comparing the count number of the counter circuit to the value of the second register. A value of the second parameter of a subsequent PWM period is stored into the second register in response to the count number reaching the value stored in the first or second register.