Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  7   REAL-TIME  CLOCK 

The RTCC1 register is an 8-bit register that is used to control the alarm interrupt function and the wait time of the 

counter. 

The RTCC1 register can be set by a 1-bit or 8-bit memory manipulation instruction. 

Reset signal generation clears this register to 00H. 

 

 

Address: FFF9EH     After reset: 00H     R/W 

Symbol 

<7> 

<6> 5 <4> 

<3> 2 <1> 

<0> 

RTCC1 WALE WALIE 

0 

WAFG  RIFG 

0 

RWST RWAIT 

 

WALE Alarm 

operation 

control 

0 

Match operation is invalid. 

1 

Match operation is valid. 

When setting a value to the WALE bit while the counter operates (RTCE = 1) and WALIE = 1, rewrite the WALE bit 

after disabling interrupt servicing INTRTC by using the interrupt mask flag register.  Furthermore, clear the WAFG 

and RTCIF flags after rewriting the WALE bit.  When setting each alarm register (WALIE flag of real-time clock 

control register 1 (RTCC1), the alarm minute register (ALARMWM), the alarm hour register (ALARMWH), and the 

alarm week register (ALARMWW)), set match operation to be invalid (“0”) for the WALE bit. 

 

WALIE 

Control of alarm interrupt (INTRTC) function operation 

0 

Does not generate interrupt on matching of alarm. 

1 

Generates interrupt on matching of alarm. 

 

WAFG 

Alarm detection status flag 

0 Alarm 

mismatch 

1 

Detection of matching of alarm 

This is a status flag that indicates detection of matching with the alarm.  It is valid only when WALE = 1 and is set to 

“1” one cycle of f

RTC

 after matching of the alarm is detected.  This flag is cleared when “0” is written to it.  Writing “1” 

to it is invalid. 

<R> 

 

RIFG 

Constant-period interrupt status flag 

0 

Constant-period interrupt is not generated. 

1 

Constant-period interrupt is generated. 

This flag indicates the status of generation of the constant-period interrupt.  When the constant-period interrupt is 

generated, it is set to “1”.  

This flag is cleared when “0” is written to it.  Writing “1” to it is invalid. 

 

R01UH0305EJ0200  Rev.2.00 

 

 

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Jul 04, 2013