Renesas Stereo System SH7709S Manual De Usuario

Rev. 5.00, 09/03, page 407 of 760

Section 13   Realtime Clock (RTC)

The SH7709S has a realtime clock (RTC) with its own 32.768-kHz crystal oscillator.

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Clock and calendar functions (BCD display): Seconds, minutes, hours, date, day of the week,
month, and year

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1-Hz to 64-Hz timer (binary display)

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Start/stop function

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30-second adjust function

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Alarm interrupt: Frame comparison of seconds, minutes, hours, date, day of the week, and
month can be used as conditions for the alarm interrupt

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Cyclic 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

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Carry interrupt: A carry interrupt indicates when a carry occurs during a counter read

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Automatic leap year correction