Hardware System Clock - Hitachi HF-BX1000 Instruction Manual

4. SPECIFICATIONS

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