R2025S Datasheet, PDF (14/47 Pages) RICOH electronics devices division – High precision I2C-Bus Real-Time Clock Module

R2025S/D
(5) /CLEN1
32-kHz Clock Output Bit 1
/CLEN1
0
Description
Enabling the 32-kHz clock output
(Default)
1
Disabling the 32-kHz clock output
Setting the /CLEN1 bit or the /CLEN2 bit (D4 in the control register 1) to 0 specifies generating clock pulses
with the oscillation frequency of the 32.768-kHz crystal oscillator for output from the 32KOUT pin.
Conversely, setting both the /CLEN1 and the /CLEN2 bit to 1 specifies disabling (“L”) such output.
(6) CTFG
Periodic Interrupt Flag Bit
CTFG
Description
0
Periodic interrupt output = “H”
1
Periodic interrupt output = “L”
(Default)
The CTFG bit is set to 1 when the periodic interrupt signals are output from the /INTRA pin (“L”). The
CTFG bit accepts only the writing of 0 in the level mode, which disables (“H”) the /INTRA pin until it is
enabled (“L”) again in the next interrupt cycle. Conversely, setting the CTFG bit to 1 causes no event.
(7) WAFG,DAFG
Alarm_W Flag Bit and Alarm_D Flag Bit
WAFG,DAFG
Description
0
Indicating a mismatch between current time and preset alarm time
(Default)
1
Indicating a match between current time and preset alarm time
The WAFG and DAFG bits are valid only when the WALE and DALE have the setting of 1, which is caused
approximately 61µs after any match between current time and preset alarm time specified by the Alarm_W
registers and the Alarm_D registers. The WAFG (DAFG) bit accepts only the writing of 0. /INTRB
(/INTRA) pin outputs off (“H”) when this bit is set to 0. And /INTRB (/INTRA) pin outputs “L” again at the
next preset alarm time. Conversely, setting the WAFG and DAFG bits to 1 causes no event. The WAFG
and DAFG bits will have the reading of 0 when the alarm interrupt circuit is disabled with the WALE and
DALE bits set to 0. The settings of the WAFG (DAFG) bit is synchronized with the output of the
/INTRB (/INTRA) pin as shown in the timing chart below.
Approx. 61µs
Approx. 61µs
WAFG(DAFG) Bit
/INTRB(/INTRA) Pin
Writing of 0 to
WAFG(DAFG) bit
(Match between
(Match between
current time and
current time and
preset alarm time)
preset alarm time)
Writing of 0 to
WAFG(DAFG) bit
(Match between
current time and
preset alarm time)
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