Each timer consists of a prescale counter (PR register) and a timer counter (TC register). The prescale counter is incremented at every cycle of the system clock. As soon as the prescale counter matches the prescale value contained in the value register it is reset to 0 and the timer counter is incremented. The timer block contains four capture circuits. The capture functionality allows measuring the time of an external event. Depending on configuration, a rising or a falling edge of the input can cause a capture event. The timer block contains four match circuits, each of which can be programmed with an individual match value and a specific action-on-match. Once the counter value matches one of the programmed match values in the MR register, one or more of the following actions can occur: a reset in the counter and prescaler, stopping of the counter, generation of an interrupt, or generation of an external notification. If interrupts are enabled and an interrupt condition occurs (match value reached or capture event received) the timer generates an interrupt.