At the core of a timer is a counter. Depending on the design, this
counter can either count up or down. The frequency of counting
(increment or decrement) is often a factor of the main processor
frequency. However, a ``timer'' often has a alternate operation mode
as a counter, in which an external clock is used to trigger
the increment or decrement.
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Copyright © 2006-02-15 by Tak Auyeung
