| 摘要 |
<p>PURPOSE:To record an accurate communication control report in an inexpensive constitution and also to automatically correct an internal timer. CONSTITUTION:The data on the present year, month, day, hour, minute and second are stored in a single byte into each input/output register of a clock IC 26. Then a CPU 21 has an access to the address of each input/output register. Thus those data can be read out of a RAM 23 and written into each input/ output register. When a D channel control part 27 receives a CONN signal from a network, the CPU 21 checks the correctness of a date information element if included in the CONN signal. When the date information element is correct, the CPU 21 corrects the date information on the IC 26 based on the date information element.</p> |
