SH7730 Datasheet, PDF (567/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 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
Note: This LSI does not have a separate power supply for the RTC. The RTC has the same
power supply as that for input and output (VccQ and VssQ). Operating the RTC alone by
shutting down the other power supplies is thus not possible.
Rev. 1.00 Sep. 19, 2007 Page 519 of 1136
REJ09B0359-0100