| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a clock alternation preventing device for executing time correction only based on time information provided by a reference clock device in which it is impossible to easily rewrite an incorporated clock. <P>SOLUTION: This clock alteration preventing device for executing time correction only based on time information to be provided by a reference clock device, is provided with a time information receiving means which preliminarily stores a code, and receives time information from the reference clock device, a code storing means which preliminarily stores the same code as a code stored by the time reception processing part, a comparing means which compares the code to be outputted based on the reception of the time information by the time reception processing part with the code stored in the code storing means and a time correcting means which corrects a time based on the time information received by the time information receiving means only when the two compared codes are the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
