m41t93 STMicroelectronics, m41t93 Datasheet - Page 32

• Manufacturer Part Number: m41t93
• Description: Serial Spi Bus Rtc With Battery Switchover
• Manufacturer: STMicroelectronics

3.9
Note:
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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 V
squarewave output will be disabled.
Table 11.
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Square wave output frequency
RS2
Square Wave Bits
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
CC
RS1
falls below the switchover (V
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Frequency
32.768
SO
8.192
4.096
2.048
1.024
None
512
256
128
64
32
16
8
4
2
1
) voltage, the
Square Wave
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
–