5. SPECIFICATION
5-18
5.7 Hardware System Clock
This equipment has a hardware system clock that uses an RTC (real-time clock) IC.
The clock has a built-in calendar and continues to work by using a backup battery, even when the system power is
off.
Table 5-1 Hardware system clock specifications
Item
Specifications
Time function
Hour/minute/second (24-hour clock)
Date function
Year/month/day
Precision
±4 seconds per day
#
Battery backup
Lithium battery
#: Rough estimates when the ambient temperature is 25°C.
The system regularly updates the internal clock by using a periodic timer. The internal clock is adjusted by reading
the time and date from the hardware clock when, for example, the system starts.
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