DS17885 Dallas, DS17885 Datasheet - Page 14

• Manufacturer Part Number: DS17885
• Description: (DS17886 / DS17887) 3V/5V Real-Time Clock
• Manufacturer: Dallas

Table 2. PERIODIC INTERRUPT RATE AND SQUARE-WAVE OUTPUT
FREQUENCY
*RS3 to RS0 determine periodic interrupt rates as listed for E32k = 0.
REGISTER B
EXTENDED
E32k
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
RS3
X
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
SELECT BITS REGISTER A
RS2
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
RS1
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
RS0
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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INTERRUPT RATE
t
PI
1.953125ms
976.5625µs
PERIODIC
3.90625ms
3.90625ms
122.070µs
244.141µs
488.281µs
7.8125ms
7.8125ms
15.625ms
31.25ms
62.5ms
125ms
250ms
500ms
None
*
SQW OUTPUT
FREQUENCY
32.768kHz
8.192kHz
4.096kHz
2.048kHz
1.024kHz
256Hz
128Hz
512Hz
256Hz
128Hz
64Hz
32Hz
16Hz
None
8Hz
4Hz
2Hz