Section 14
Realtime Clock (RTC)
Rev. 0.50 May 18, 2006 Page 693 of 1588
REJ09B0313-0050
14.4.4 Alarm
Function
Figure 14.4 shows how to use the alarm function.
Write 0 to AIE in RCR1
to prevent errorneous interrupt
Clock running
Set alarm time
Disable alarm interrupt
Always clear, since the flag may have been
set while the alarm time was being set.
Write 1 to AIE in RCR1
Clear alarm flag
Enable alarm interrupt
Monitor alarm time
(wait for interrupt or
check alarm flag)
Figure 14.4 Using 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.
Содержание Single-Chip Microcomputer SH7203
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Страница 696: ...Section 13 Watchdog Timer WDT Rev 0 50 May 18 2006 Page 666 of 1588 REJ09B0313 0050 ...
Страница 726: ...Section 14 Realtime Clock RTC Rev 0 50 May 18 2006 Page 696 of 1588 REJ09B0313 0050 ...
Страница 796: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 0 50 May 18 2006 Page 766 of 1588 REJ09B0313 0050 ...
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Страница 1226: ...Section 23 USB 2 0 Host Function Module USB Rev 0 50 May 18 2006 Page 1196 of 1588 REJ09B0313 0050 ...
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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