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M41T93 bảng dữ liệu(PDF) 31 Page - STMicroelectronics

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M41T93 bảng dữ liệu(HTML) 31 Page - STMicroelectronics

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M41T93
Clock operation
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3.9
Square wave output
The M41T93 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 SQW pin can be turned on and off under software control with the Square
Wave Enable Bit (SQWE) located in Register 0Ah.
Note:
If the SQWE Bit is set to '1', and VCC falls below the switchover (VSO) voltage, the
squarewave output will be disabled.
Table 11.
Square wave output frequency
Square Wave Bits
Square Wave
RS3
RS2
RS1
RS0
Frequency
Units
0000
None
–
0001
32.768
kHz
0010
8.192
kHz
0011
4.096
kHz
0100
2.048
kHz
0101
1.024
kHz
0110
512
Hz
0111
256
Hz
1000
128
Hz
1001
64
Hz
1010
32
Hz
1011
16
Hz
11008
Hz
11014
Hz
11102
Hz
11111
Hz



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