TIME TIMER

PROBLEM TO BE SOLVED: To provide a time timer which has high-precision resolution, at a low price without requiring a special hardware. SOLUTION: In the time timer 1, a millisecond counter 13 receives an interruption signal at every millisecond from an interval timer 12 and counts at every millisecond. The millisecond counter 13 is interrupted by a real-time clock 11 at intervals of one second while synchronism with the real time clock 11 is taken into consideration, and is forcibly initialized to 0. Thus, the time represented as years, months, days, hours, minutes, and seconds clocked by the real time clock 11 is synchronize with the milliseconds clocked by the millisecond counter 13. The time timer 1 is so constituted as to output a signal of the time clocked by the real time clock 11 and a signal of the counted value counted by the millisecond counter 13 to the outside. Consequently, the time timer having resolution of one millisecond can be obtained.