Hitachi HF-BX1000, Instruction Manual, Page: 97 / 197

4. SPECIFICATIONS
4-12
4.3 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.
Item Specifications
Time function
Hour/Minute/Second
(24-hour clock)
Date function Year/Month/Date
Precision ± 3 minutes per month (*)
Battery backup Lithium button cell battery
(*) Rough estimates when the ambient
temperature is 25°C.
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.