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STFPC320 Datasheet(PDF) 30 Page - STMicroelectronics |
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STFPC320 Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 78 page  Real-time clock (RTC) operation STFPC320 30/78 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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