DS17285-3 查看數據表（PDF） - Maxim Integrated
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DS17285-3 Datasheet PDF : 31 Pages
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DS17285/DS17287/
DS17485/DS17487/
DS17885/DS17887
Bits 3 to 0: Rate Selector Bits (RS3 to RS0). These
four rate-selection bits select one of the 13 taps on the
15-stage divider or disable the divider output. The tap
selected can be used to generate an output square wave
(SQW pin) and/or a periodic interrupt. The user can do
one of the following:
1) Enable the interrupt with the PIE bit;
Real-Time Clocks
2) Enable the SQW output pin with the SQWE or E32k
bits;
3) Enable both at the same time and the same rate; or
4) Enable neither.
Table 4 lists the periodic interrupt rates and the square-
wave frequencies that can be chosen with the RS bits.
Table 4. Periodic Interrupt Rate and Square-Wave Output Frequency
EXT REG B
E32K
SELECT BITS REGISTER A
RS3
RS2
RS1
RS0
tPI PERIODIC INTERRUPT
RATE
0
0
0
0
0
None
0
0
0
0
1
3.90625ms
0
0
0
1
0
7.8125ms
0
0
0
1
1
122.070Fs
0
0
1
0
0
244.141Fs
0
0
1
0
1
488.281Fs
0
0
1
1
0
976.5625Fs
0
0
1
1
1
1.953125ms
0
1
0
0
0
3.90625ms
0
1
0
0
1
7.8125ms
0
1
0
1
0
15.625ms
0
1
0
1
1
31.25ms
0
1
1
0
0
62.5ms
0
1
1
0
1
125ms
0
1
1
1
0
250ms
0
1
1
1
1
500ms
1
X
X
X
X
*
*RS3 to RS0 determine periodic interrupt rates as listed for E32K = 0.
SQW OUTPUT FREQUENCY
None
256Hz
128Hz
8.192kHz
4.096kHz
2.048kHz
1.024kHz
512Hz
256Hz
128Hz
64Hz
32Hz
16Hz
8Hz
4Hz
2Hz
32.768kHz
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