Section 11 Realtime Clock (Rtc); Overview; Features - Hitachi SH7750 series Hardware Manual

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The SH7750 includes an on-chip realtime clock (RTC) and a 32.768 kHz crystal oscillator for use

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, or month 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

Section 11 Realtime Clock (RTC)

Rev. 4.0, 04/00, page 217 of 850

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