BU9873 Datasheet, PDF (21/40 Pages) Rohm – I2C BUS Serial Interface RTC with High-precision Oscillation Adjustment

BU9873
Datasheet
5-3. INTRB Output Control
Alarm interrupt and periodic interrupt are both outputted from INTRB pin, so there are totally three types of signal from this
pin.
If more than one signal is triggered at the same time, the output becomes a NOR waveform of these signals.
Example: When Alarm_A and Alarm_B are output from the INTRB pin
AAFG
BAFG
INTRB
Figure 24. INTRB output control
By checking the flag bit, which interrupt outputted from INTRB pin can be distinguished.
Alarm_A
Alarm_B
Periodic interrupt
Flag bit
AAFG (D1 at Fh)
BAFG (D0 at Fh)
CTFG (D2 at Fh)
Enable bit
AALE (D7 at Eh)
BALE (D6 at Eh)
Disabled at CT2=CT1=CT0=0
(D2 to D0 at Eh)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
21/37
TSZ02201-0919AGZ00010-1-2
13.Sep.2013 REV.001