UPD78F1502AGK-GAK-AX Datasheet, PDF (366/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 7 REAL-TIME COUNTER
(3) Real-time counter control register 1 (RTCC1)
The RTCC1 register is an 8-bit register that is used to control the alarm interrupt function and the wait time of the
counter.
RTCC1 can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 7-4. Format of Real-Time Counter Control Register 1 (RTCC1) (1/2)
Address: FFF9EH After reset: 00H R/W
Symbol
<7>
<6>
5
RTCC1
WALE
WALIE
0
<4>
WAFG
<3>
RIFG
2
<1>
<0>
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 RTCC1, the
ALARMWM register, the ALARMWH register, and the ALARMWW register), set match operation to be invalid (“0”)
for the WALE bit.
WALIE
0
1
Control of alarm interrupt (INTRTC) function operation
Does not generate interrupt on matching of alarm.
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 clock (32.768 kHz) after matching of the alarm is detected. This flag is cleared when “0” is written to it.
Writing “1” to it is invalid.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011