timer; clock register
Technical computing term for a hardware or software component that measures time intervals or maintains a clock count.
This microcontroller has a built-in high-precision timer.
計時機構のカウント値を読み取って経過時間を計算する。
Read the count value of the clock register to calculate the elapsed time.
タイマー is the common loanword for a general-purpose timer, while 計時機構 is a more formal, technical term used in computing and engineering.
Compound of 計時 (time measurement) and 機構 (mechanism). A technical term likely coined in modern engineering contexts.