ATmega324PB has two additional 16-bit Timer/Counters(TC3 and TC4) with separate Prescaler, Compare Mode, and Capture Mode. There are three 16-bit Timer/Counters (TC1, TC3, and TC4) and ten PWM channels available in ATmega324PB. Refer to the I/O Multiplexing section in the ATmega324PB device datasheet for details about the pin mapping for this peripheral.