M41T93 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M41T93' PDF : 51 Pages View PDF
Clock operation
M41T93
3.9
Note:
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.
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
RS3
RS2
RS1
RS0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Square Wave
Frequency
None
32.768
8.192
4.096
2.048
1.024
512
256
128
64
32
16
8
4
2
1
Units
–
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
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