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A counter accumulates an unknown quantity of external events over a known interval of time.

The measurement of interest is typically frequency when the events are periodic. If the events are random, the measurement involves event density over time.

A timer accumulates a series events of a known interval over an interval that is being measured.

The measurement of interest is typically the time elapsed between two events. If the start and stop events recur periodically, multiple measurements can be made and averaged, allowing for increased resolution.

Counter/timers in MPU's are typically just counters that count external events in counter mode and processor cycles in timer mode.

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15y ago

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