H8SSLASH2218 datasheet(408/750 Pages) RENESAS

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Section 11 Realtime Clock (RTC)

Rev.6.00 Jun. 03, 2008 Page 360 of 698

REJ09B0074-0600

11.5

Interrupt Source

The RTC interrupt sources are listed in table 11.2. 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 (include ISCRH and IER of

interrupt controller) are set. Do not set multiple interrupt enable bits in RTCCR2 simultaneously

to 1.

When an interrupt request of the RTC occurs, the IRQ5F flag in ISR is set to 1. When clearing the

flag, write 0 after reading the flag = 1.

Figure 11.5 shows the initializing setting procedure in using the RTC interrupt and figure 11.6

shows an example of the RTC interrupt handling routine.

Table 11.2

Interrupt Source

Interrupt Name

Interrupt Source

Interrupt Enable Bit

Overflow interrupt

Occurs when the free running counter is

overflown.

FOIE

Week periodic interrupt

Occurs every week when the day-of-week

date register value becomes 0.

WKIE

Day periodic interrupt

Occurs every day when the day-of-week date

DYIE

Hour periodic interrupt

Occurs every hour when the hour date

HRIE

Minute periodic interrupt

Occurs every minute when the minute date

MNIE

Second periodic interrupt

Occurs every second when the second date

SEIE

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