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M41T81S датащи(PDF) 17 Page - STMicroelectronics

номер детали M41T81S
подробное описание детали  Serial Access Real-Time Clock with Alarms
PDF  29 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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M41T81S датащи(HTML) 17 Page - STMicroelectronics

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M41T81S
Square Wave Output
The M41T81S offers the user a programmable
square wave function which is output on the SQW
pin. RS3-RS0 bits located in 13h establish the
square wave output frequency. These frequencies
are listed in Table 4. Once the selection of the
SQW frequency has been completed, the IRQ/FT/
OUT/SQW pin can be turned on and off under soft-
ware control with the Square Wave Enable Bit
(SQWE) located in Register 0Ah.
Table 4. Square Wave Output Frequency
Square Wave Bits
Square Wave
RS3
RS2
RS1
RS0
Frequency
Units
00
00
None
-
00
01
32.768
kHz
00
10
8.192
kHz
00
11
4.096
kHz
01
00
2.048
kHz
01
01
1.024
kHz
01
10
512
Hz
01
11
256
Hz
10
00
128
Hz
10
01
64
Hz
10
10
32
Hz
10
11
16
Hz
11
00
8
Hz
11
01
4
Hz
11
10
2
Hz
11
11
1
Hz



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