M4T32-BR12SH STMICROELECTRONICS [STMicroelectronics], M4T32-BR12SH Datasheet - Page 19

• Manufacturer Part Number: M4T32-BR12SH
• Description: 5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Square Wave Output
The M41ST85Y/W offers the user a programma-
ble square wave function which is output on the
SQW pin. RS3-RS0 bits located in 13h establish
the square wave output frequency. These fre-
quencies are listed in Table 4. Once the selection
Table 4. Square Wave Output Frequency
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
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
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.
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
M41ST85Y, M41ST85W
64
32
16
8
4
2
1
Square Wave
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
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