SH7763 Datasheet, PDF (825/2026 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 22 Realtime Clock (RTC)
Section 22 Realtime Clock (RTC)
This LSI includes an on-chip realtime clock (RTC) and a 32.768 kHz crystal oscillator for use by
the RTC.
22.1 Features
The RTC has the following features.
• Clock and calendar functions (BCD display)
Counts seconds, minutes, hours, day-of-week, days, months, and years.
• 1 to 64 Hz timer (binary display)
The 64 Hz counter register indicates a state of 64 Hz to 1 Hz within the RTC frequency divider
• Start/stop function
• 30-second adjustment function
• Alarm interrupts
Comparison with second, minute, hour, day-of-week, day, month, or year can be selected as
the alarm interrupt condition
• Periodic interrupts
An interrupt period of 1/256 second, 1/64 second, 1/16 second, 1/4 second, 1/2 second, 1
second, or 2 seconds can be selected
• Carry interrupt
Carry interrupt function indicating a second counter carry, or a 64 Hz counter carry when the
64 Hz counter is read
• Automatic leap year adjustment
Rev. 1.00 Oct. 01, 2007 Page 759 of 1956
REJ09B0256-0100