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M41T81 Datasheet(PDF) 19 Page - STMicroelectronics |
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M41T81 Datasheet(HTML) 19 Page - STMicroelectronics |
19 / 30 page ![]() M41T81 Clock operation 19/30 3.6 Square wave output The M41T81 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 software control with the Square Wave Enable Bit (SQWE) located in Register 0Ah. 3.7 Century bit Bits D7 and D6 of Clock Register 03h contain the CENTURY ENABLE Bit (CEB) and the CENTURY Bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,' CB will not toggle. Table 4. Square wave output frequency Square wave bits Square wave RS3 RS2 RS1 RS0 Frequency Units 0000 None - 0001 32.768 kHz 0010 8.192 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 |
Similar Part No. - M41T81_06 |
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Similar Description - M41T81_06 |
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