rs5c338a RICOH Co.,Ltd., rs5c338a Datasheet - Page 37

• Manufacturer Part Number: rs5c338a
• Description: 3-wire Serial Interface Real-time Clock Ics With Voltage Monitoring Function
• Manufacturer: RICOH Co.,Ltd.

Relation Between the Mode Waveform and the CTFG Bit
• Pulse mode
• Level mode
5. 32-kHz Clock Output
32.768-kHz clock pulses are output from the 32KOUT pin when either the CLEN1 bit in the control register 2 or the
CLEN2 bit in the control register 1 is set to 0 when the CLKC pin is set to high. If the conditions described above
are not satisfied, the output is set to high.
The 32KOUT pin output is synchronized with the CLEN1, CLEN2 bit, and CLKC pin settings as illustrated in the tim-
ing chart below.
*
(D3 at Address Fh)
) In the pulse mode, the increment of the second counter is delayed by approximately 92 µs from the falling edge of clock pulses. Consequently, time
readings immediately after the falling edge of clock pulses may appear to lag behind the time counts of the real-time clocks by approximately 1 second.
Rewriting the second counter will reset the other time counters of less than 1 second, driving the INTR pin low.
0 (Default)
CLEN1
1
*
*
CTFG bit
INTR pin
CLEN1 or CLEN2 bit setting
CTFG bit
INTR pin
32KOUT pin output
(Increment of second counter)
(D4 at Address Eh)
second counter)
(Increment of
0 (Default)
CLKC pin or
CLEN2
*
*
1
Setting CTFG bit to 0
MAX. 76.3µs
Approx. 92µs
second counter)
(Increment of
CLKC pin output
Rewriting of the second counter
*
0
1
1
second counter)
(Increment of
32KOUT pin output
(CMOS output)
Setting CTFG bit to 0
Clock pulses
“L”
R
×
5C338A
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