m41st84w STMicroelectronics, m41st84w Datasheet - Page 19

• Manufacturer Part Number: m41st84w
• Description: 3.0/3.3v I 2c Serial Rtc With Supervisory Functions
• Manufacturer: STMicroelectronics

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. Square Wave Output Frequency
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Table
5.. Once the selection of the
RS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Square Wave Bits
RS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
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.
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Frequency
32.768
8.192
4.096
2.048
1.024
None
512
256
128
64
32
16
8
4
2
1
Square Wave
M41ST84W
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
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