Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  7   REAL-TIME  CLOCK 

Set time of alarm after setting 0 to WALE (alarm operation invalid.) first. 

 

 

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 

 

 

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Jul 04, 2013