| 摘要 |
In a real time clock having a register, a preinstalled central processing unit issues a control instruction to hold a time stamp of an external register in the real time clock and then reads the time stamp of the external register, if a server or a control end needs to read the time stamp of the real time clock. The real time clock having a register is comprised of a timing generator for generating a time stamp that is stored in the external register and a controller for controlling the timing generator and the external register. The preinstalled central processing unit can read the time stamp stored in the external register, so as to accurately read the time of issuing a read command given by the central processing unit, regardless of whether or not the preinstalled central processing unit is situated in a busy state of executing other programs.
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