Renesas RL78/G1H User Manual

RL78/G1H CHAPTER 9 REAL-TIME CLOCK
R01UH0575EJ0120 Rev. 1.20 Page 257 of 920
Dec 22, 2016
9.4.4 Setting alarm of real-time clock
Set time of alarm after setting 0 to WALE (alarm operation invalid) first.
Figure 9 - 22 Alarm Setting Procedure
Remark 1. The alarm week register (ALARMWW), alarm hour register (ALARMWH), and alarm week register (ALARMWW) may be
written in any sequence.
Remark 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.
Constant-period interrupt servicing
Alarm processing
WALE = 0
Start
Setting ALARMWM
INTRTC = 1 ?
Match operation of alarm is invalid.
Sets alarm minute register.
Yes
WALIE = 1
Interrupt is generated when alarm matches.
Setting ALARMWH
Sets alarm hour register.
Setting ALARMWW
Sets alarm week register.
WALE = 1
Match operation of alarm is valid.
WAFG = 1 ?
No
Yes
Match detection of alarm
No

Renesas RL78/G1H Specifications

General

Brand	Renesas
Model	RL78/G1H
Category	Microcontrollers
Language	English