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M41ST84W 数据表(PDF) 19 Page - STMicroelectronics

部件名 M41ST84W
功能描述  3.0/3.3V I2C Serial RTC with Supervisory Functions
PDF  29 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M41ST84W 数据表(HTML) 19 Page - STMicroelectronics

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M41ST84W
Square Wave Output
The M41ST84W offers the user a programmable
square wave function which is output on the SQW
pin. The RS3-RS0 Bits located in 13h establish the
square wave output frequency. These frequencies
are listed in Table 5.. Once the selection of the
SQW frequency has been completed, the SQW
pin can be turned on and off under software con-
trol with the Square Wave Enable Bit (SQWE) lo-
cated in Register 0Ah.
Table 5. Square Wave Output Frequency
Square Wave Bits
Square Wave
RS3
RS2
RS1
RS0
Frequency
Units
0
000
None
–
0
0
0
1
32.768
kHz
0
0
1
0
8.192
kHz
0
0
1
1
4.096
kHz
0
1
0
0
2.048
kHz
0
1
0
1
1.024
kHz
0
110
512
Hz
0
111
256
Hz
1
000
128
Hz
1
001
64
Hz
1
010
32
Hz
1
011
16
Hz
1
1008
Hz
1
1014
Hz
1
1102
Hz
1
1111
Hz



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