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RS5C372A-E2-F Datasheet(PDF) 21 Page - RICOH electronics devices division

Part No. RS5C372A-E2-F
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RS5C372A-E2-F Datasheet(HTML) 21 Page - RICOH electronics devices division

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RS5C372A/B
20
2.2-2 ADJ
30 Second Adjust Bit
ADJ
Description
0
Ordinary operation
1
Second digit adjustment
The following operations are performed by setting the second ADJ bit to 1.
1) For second digits ranging from “00” to “29” seconds:
Time counters smaller than seconds are reset and second digits are set to “00”.
2) For second digits ranging from “30” to “59” seconds:
Time counters smaller than seconds are reset and second digits are set to “00”.
Minute digits are incremented by 1.
Second digits are adjusted within 122s (within 125s: when 32.000kHz crystal is used) from writing operation
to ADJ.
The ADJ bit is for write only and allows no read operation.
2.2-3 XSTP
Oscillator Halt Sensing Bit
XSTP
Description
0
Ordinary oscillation
1
Oscillator halt sensing
(Default)
The XSTP bit senses the oscillator halt.
When oscillation is halted after initial power on from 0V or drop in supply voltage the bit is set to “1” and which
remains to be “1” after it is restarted. This bit may be used to judge validity of clock and calendar count data
after power on or supply voltage drop.
When this bit is set to “1”, XSL , F
6
to F0, CT2, CT1, CT0, AALE, BALE, SL2, SL1, CLEN and TEST bits are reset
to “0”. INTRA ( INTR )will stop output and the INTRB (32KOUT) will output 32kHz clock pulses.
The XSTP bit is set to “0” by setting the control register 2 (address Fh) during ordinary oscillation.
) INTRA and INTRB for the RS5C372A, INTR and 32KOUT for the RS5C372B.
2.2-4 CLEN
32-kHz Clock Output Bit
CLEN
Description
0
32-kHz clock output enabled
(Default)
1
32-kHz clock output disabled
By setting this bit to “0”, output of clock pulses of the same frequency as the crystal oscillator is enabled.


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