UPD78F0411GA-GAM-AX Datasheet, PDF (276/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
(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.
Caution Set a decimal value of 00 to 23, 01 to 12, or 21 to 32 to this register in BCD code. If a value
outside the range is set, the alarm is not detected.
Figure 9-16. Format of Alarm Hour Register (ALARMWH)
Address: FF87H After reset: 12H R/W
Symbol
7
6
ALARMWH
0
0
5
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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User’s Manual U18698EJ1V0UD