UPD78F1502AGK-GAK-AX Datasheet, PDF (375/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 7 REAL-TIME COUNTER
(14) Alarm minute register (ALARMWM)
This register is used to set minutes of alarm.
ALARMWM can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Caution Set a decimal value of 00 to 59 to this register in BCD code. If a value outside the range is set,
the alarm is not detected.
Figure 7-15. Format of Alarm Minute Register (ALARMWM)
Address: FFF9AH After reset: 00H R/W
Symbol
7
6
5
ALARMWM
0
WM40
WM20
4
WM10
3
WM8
2
WM4
1
WM2
0
WM1
(15) Alarm hour register (ALARMWH)
This register is used to set hours of alarm.
ALARMWH can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 12H.
However, the value of this register is 00H if the AMPM bit (bit 3 of the RTCC0 register) is set to 1 after reset.
Caution Set a decimal value of 00 to 23, or 01 to 12 and 21 to 32 to this register in BCD code. If a value
outside the range is set, the alarm is not detected.
Figure 7-16. Format of Alarm Hour Register (ALARMWH)
Address: FFF9BH After reset: 12H R/W
Symbol
7
6
5
ALARMWH
0
0
WH20
4
WH10
3
WH8
2
WH4
1
WH2
0
WH1
Caution Bit 5 (WH20) of ALARMWH indicates AM(0)/PM(1) if AMPM = 0 (if the 12-hour system is selected).
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Jun 20, 2011