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RL78/G1A CHAPTER 7 REAL-TIME CLOCK
7.4.4 Setting alarm of real-time clock
Set time of alarm after setting 0 to WALE (alarm operation invalid.) first.
Figure 7-23. Alarm processing Procedure
WALE = 0
Setting ALARMWM
Start
INTRTC = 1?
Match operation of alarm is invalid.
Sets alarm minute register.
Alarm interrupt processing
Yes
WALIE = 1
alarm match interrupts is valid..
Setting ALARMWH
Sets alarm hour register.
Setting ALARMWW
Sets alarm week register.
WALE = 1
Match operation of alarm is valid.
WAFG = 1?
No
Yes
Constant-period interrupt servicing
Match detection of alarm
No
Remarks 1. The alarm week register (ALARMWW), alarm hour register (ALARMWH), and alarm week register
(ALARMWW) may be written in any sequence.
2. Fixed-cycle interrupts and alarm match interrupts use the same interrupt source (INTRTC). When using
these two types of interrupts at the same time, which interrupt occurred can be judged by checking the
fixed-cycle interrupt status flag (RIFG) and the alarm detection status flag (WAFG) upon INTRTC
occurrence.
R01UH0305EJ0200 Rev.2.00 314
Jul 04, 2013