Section 11 Realtime Clock (RTC)
11.1
Overview
The SH7750 Series includes an on-chip realtime clock (RTC) and a 32.768 kHz crystal oscillator
for use by the RTC.
11.1.1 Features
The RTC has the following features.
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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
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30-second adjustment function
Alarm interrupts
Comparison with second, minute, hour, day-of-week, day, month, or year (year is available
only with the SH7750R) can be selected as the alarm interrupt condition
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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. 6.0, 07/02, page 267 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
