Timers

Timers All operating systems need to know the time, so the modern PC includes a special peripheral called the Real Time Clock (RTC). This provides two things: a reliable time of day and an accurate timing interval. The RTC has its own battery so that it continues to run even when the PC is not powered on. This is how your PC always “knows” the correct date and time. The interval timer allows the operating system to accurately schedule essential work.