SH7721 datasheet(621/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 17 Realtime Clock (RTC)

RTCS320B_000020020900

Rev. 3.00 Jan. 18, 2008 Page 559 of 1458

REJ09B0033-0300

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

SH7721 Datasheet(PDF) 621 Page - Renesas Technology Corp