Section 10 Realtime Clock (RTC)
10.5
Interrupt Sources
There are five kinds of RTC interrupts: week interrupts, day interrupts, hour interrupts, minute
interrupts, and second interrupts.
When using an interrupt, initiate the RTC last after other registers are set. Do not set multiple
interrupt enable bits in RTCCR2 simultaneously to 1.
When an interrupt request of the RTC occurs, the IRRTA flag in IRR1 is set to 1. When clearing
the flag, write 0.
Table 10.2 Interrupt Sources
Interrupt Name
Interrupt Source
Interrupt Enable Bit
Overflow interrupt
Occurs when the free running counter is
overflowed.
FOIE
Week periodic interrupt
Day periodic interrupt
Hour periodic interrupt
Minute periodic interrupt
Occurs every week when the day-of-week
date register value becomes 0.
WKIE
Occurs every day when the day-of-week date DYIE
register is counted.
Occurs every hour when the hour date
register is counted.
HRIE
Occurs every minute when the minute date
register is counted.
MNIE
Second periodic interrupt Occurs every second when the second date SCIE
register is counted.
Rev. 3.00 Sep. 10, 2007 Page 178 of 528
REJ09B0216-0300
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