HOWTO SET THE RTC POWER ON TIME FULL

Both user software and the internal clock directly write and read the RTC time registers (RTCSS, RTCS, RTCM, RTCH, RTCD0, RTCD1). Real-time clock control and status bit summaryД«e aware that TRM2 and its inverse are not present on the DS5250.

HOWTO SET THE RTC POWER ON TIME FULL

Consult the full bit or register description for complete details. Bits and registers designated as unchanged after a reset may be indeterminate following a no-battery reset.

The registers and control bits used by the RTC are shown in Table 1. The subsecond register provides a resolution of 1/256 of a second and a maximum rollover count of 1 second. In addition there is an alarm register for the subsecond, seconds, minutes, and hours registers. The RTC consists of subsecond, second, minute, hour, day of the week, and two total day count registers. The RTC is controlled by dedicated Special Function Registers (SFRs). No load capacitors are required with the RTC crystal. Integration of the RTC means that only a 32.768kHz crystal is required. Although software timing loops or internal timers could be used for such measurements, they are crystal dependent, inefficient for long time measurements, and are incompatible with the use of power management modes. The DS87C530 and DS5250 incorporate a real-time clock (RTC) and alarm to allow the user to perform real-world timing operations such as time-stamping an event, performing a task at a specific time, or executing very long timing delays.

Howto set the rtc power on time