| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a data processor capable of reducing the burden of an operator on work and management, easily improving precision and correcting time. SOLUTION: When the operator inputs reference time at two timings, the external elapsed time calculation part 120 of CPU 106 in the data processor 100 obtains a reference time difference and an internal elapsed time measuring part 122 obtains internal time from clock LSI 110 and obtains an internal time difference corresponding to the reference time difference. A clocking error calculation part 124 calculates a clocking error per unit time based on the difference between the reference time difference and the internal time difference. The clocking error is stored in the clocking error storage area 132 of a back up memory 108. CPU 106 reads it and calculates the shift of internal time, which occurs during that time, at prescribed time intervals. It is subtracted from infernal time at correction timing so as to correct it.</p> |
