SH7720 Datasheet, PDF (621/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 17 Realtime Clock (RTC)
Section 17 Realtime Clock (RTC)
This LSI has a realtime clock (RTC) with its own 32.768-kHz crystal oscillator.
17.1 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)
64-Hz counter indicates the state of the RTC divider circuit between 64 Hz and 1 Hz
• 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
RTCS320B_000020020900
Rev. 3.00 Jan. 18, 2008 Page 559 of 1458
REJ09B0033-0300