STFPC320 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STFPC320
STMicroelectronics
STFPC320 Datasheet PDF : 78 Pages
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Real-time clock (RTC) operation
STFPC320
6.8
Square wave output
The STFPC320 offers the user a programmable square wave function which is output on the
IRQ_N/SQW pin. RS3-RS0 bits located in 04h register establish the square wave output
frequency. These frequencies are listed in Table 6. Once the selection of the SQW
frequency has been completed, the IRQ_N/SQW pin can be turned on or off under software
control with the square wave enable bit (SQWE) located in register 0Ah. The initial power-up
default for the IRQ_N/SQW output is 32 KHz.
Table 6.
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
Units
None
-
32.768
kHz
8.162
kHz
4.096
kHz
2.048
kHz
1.024
kHz
512
Hz
256
Hz
128
Hz
64
Hz
32
Hz
16
Hz
8
Hz
4
Hz
2
Hz
1
Hz
30/78
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