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M41T80 Datasheet(PDF) 15 Page - STMicroelectronics |
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M41T80 Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 20 page  15/20 M41T80 Table 10. Square Wave Output Frequency Full-time 32kHz Square Wave Output The M41T80 offers the user a special 32kHz square wave function which defaults to output on the F32k pin (Pin 3) as long as VCC is valid, and the oscillator is running (ST Bit = '0'). This function is available within four seconds of initial power-up and can only be disabled by setting the 32kE Bit to '0' or the ST Bit to '1.' If not used, the F32k pin should be disconnected and allowed to float. Note: The F32k pin is an open drain which requires an external pull-up resistor. Square Wave Bits Square Wave RS3 RS2 RS1 RS0 Frequency Units 00 00 None - 0 0 0 1 32.768 kHz 0 0 1 0 8.192 kHz 0 0 1 1 4.096 kHz 0 1 0 0 2.048 kHz 0 1 0 1 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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