Hardware System Clock; Table 5-1 Hardware System Clock Specification - Hitachi HF-W100E Instruction Manual

5.4 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 using a backup battery even when
the system power is off.
(*) Rough estimates when the ambient temperature is 25
For your information, the system program normally 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.

Table 5-1 Hardware System Clock Specification

Item
Time function
Date function
Precision
Battery
backup
Specifications
Hour/Minute/Second
(24-hours clock)
Year/Month/Date
± 3 minutes per month (*)
Lithium battery
5-11
5. SPECIFICATION
°
C.