R0K572011S000BE Renesas Electronics America, R0K572011S000BE Datasheet - Page 692

• Manufacturer Part Number: R0K572011S000BE
• Description: KIT STARTER FOR SH7201
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: MCUr

Specifications of R0K572011S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7201
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 15 Realtime Clock (RTC)
15.4.4
Figure 15.4 shows how to use the alarm function.
Alarms can be generated using seconds, minutes, hours, day of the week, date, month, year, or any
combination of these. Set the ENB bit in the register on which the alarm is placed to 1, and then
set the alarm time in the lower bits. Clear the ENB bit in the register on which the alarm is not
placed to 0.
When the clock and alarm times match, 1 is set in the AF bit in RCR1. Alarm detection can be
checked by reading this bit, but normally it is done by interrupt. If 1 is set in the AIE bit in RCR1,
an interrupt is generated when an alarm occurs.
The alarm flag is set when the clock and alarm times match. However, the alarm flag can be
cleared by writing 0.
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Alarm Function
Disable alarm interrupt
Enable alarm interrupt
(wait for interrupt or
Monitor alarm time
check alarm flag)
Clear alarm flag
Set alarm time
Clock running
Figure 15.4 Using Alarm Function
Write 0 to AIE in RCR1
to prevent errorneous interrupt
Always clear, since the flag may have been
set while the alarm time was being set.
Write 1 to AIE in RCR1
R01UH0026EJ0300 Rev. 3.00
SH7201 Group
Sep 24, 2010