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DS1307ZN Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS1307ZN Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page DS1307 64 x 8, Serial, I 2C Real-Time Clock 9 of 15 CONTROL REGISTER The DS1307 control register is used to control the operation of the SQW/OUT pin. BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 OUT 0 0 SQWE 0 0 RS1 RS0 Bit 7: Output Control (OUT). This bit controls the output level of the SQW/OUT pin when the square- wave output is disabled. If SQWE = 0, the logic level on the SQW/OUT pin is 1 if OUT = 1 and is 0 if OUT = 0. Bit 4: Square-Wave Enable (SQWE). This bit, when set to logic 1, enables the oscillator output. The frequency of the square-wave output depends upon the value of the RS0 and RS1 bits. With the square- wave output set to 1Hz, the clock registers update on the falling edge of the square wave. Bits 1, 0: Rate Select (RS1, RS0). These bits control the frequency of the square-wave output when the square-wave output has been enabled. The following table lists the square-wave frequencies that can be selected with the RS bits. RS1 RS0 SQW/OUT OUTPUT SQWE OUT 0 0 1Hz 1 X 0 1 4.096kHz 1 X 1 0 8.192kHz 1 X 1 1 32.768kHz 1 X X X 0 0 0 X X 1 0 1 |
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