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M41T81S Datasheet(PDF) 17 Page - STMicroelectronics |
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M41T81S Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 29 page  17/29 M41T81S Square Wave Output The M41T81S 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 IRQ/FT/ OUT/SQW pin can be turned on and off under soft- ware control with the Square Wave Enable Bit (SQWE) located in Register 0Ah. Table 4. Square Wave Output Frequency Square Wave Bits Square Wave RS3 RS2 RS1 RS0 Frequency Units 00 00 None - 00 01 32.768 kHz 00 10 8.192 kHz 00 11 4.096 kHz 01 00 2.048 kHz 01 01 1.024 kHz 01 10 512 Hz 01 11 256 Hz 10 00 128 Hz 10 01 64 Hz 10 10 32 Hz 10 11 16 Hz 11 00 8 Hz 11 01 4 Hz 11 10 2 Hz 11 11 1 Hz |
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