HD6417705 Datasheet, PDF (397/739 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

Section 15 Realtime Clock (RTC)
This LSI has a realtime clock (RTC) with its own 32.768 kHz crystal oscillator. A block diagram
of the RTC is shown in figure 15.1.
15.1 Features
The RTC has the following features:
• Clock and calendar functions (BCD format): seconds, minutes, hours, date, day of the week,
month, and year
• 1-Hz to 64-Hz timer (binary format)
• Start/stop function
• 30-second adjust function
• Alarm interrupt: frame comparison of seconds, minutes, hours, date, day of the week, month,
and year can be used as conditions for the alarm interrupt
• Periodic interrupts: the interrupt cycle may be 1/256 second, 1/64 second, 1/16 second, 1/4
second, 1/2 second, 1 second, or 2 seconds
• Carry interrupt: a carry interrupt indicates when a carry occurs during a counter read
• Automatic leap year adjustment
RTCS320A_000020020100
Rev. 2.00, 09/03, page 351 of 690