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A timer is a specialized type of clock for measuring time intervals. By function timers can be categorized to two main types. A timer which counts upwards from zero for measuring elapsed time is often called a ''stopwatch''; a device which counts down from a specified time interval is more usually called a ''timer''〔 or a countdown timer. A simple example for this type is an hourglass. By working method timers have two main groups: Hardware and Software timers. Some timers sound an audible indication that the time interval has expired. Time switches, timing mechanisms which activate a switch, are sometimes also called "timers". ==Hardware timers== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Timer」の詳細全文を読む スポンサード リンク
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