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STFPC320 数据表(PDF) 30 Page - STMicroelectronics

部件名 STFPC320
功能描述  Front panel controller/driver with standby power management and real-time clock
PDF  78 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STFPC320 数据表(HTML) 30 Page - STMicroelectronics

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Real-time clock (RTC) operation
STFPC320
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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
Square wave
RS3
RS2
RS1
RS0
Frequency
Units
0000
None
-
0001
32.768
kHz
0010
8.162
kHz
0011
4.096
kHz
0100
2.048
kHz
0101
1.024
kHz
0110
512
Hz
0111
256
Hz
1000
128
Hz
1001
64
Hz
1010
32
Hz
1011
16
Hz
11008
Hz
11014
Hz
11102
Hz
11111
Hz



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