Programmable Interval Timer  (English, Paperback, unknown)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computing, a programmable interval timer (PIT) is a counter which triggers an interrupt when it reaches the programmed count. PITs counters may be one-shot or periodic. One-shot timers interrupt only once, and then stop counting. Periodic timers interrupt every time they reach a specific value. Counters are usually programmed with fixed increment intervals which determine how long the counter counts before it triggers an interrupt. The interval increments therefore determine the resolution for which the counter may be programmed to generate its one-shot or periodic interrupt.