DS1307ZN+T&R 参数 Datasheet PDF下载

DS1307 64 x 8, Serial, I

2

C Real-Time Clock

CONTROL REGISTER

The DS1307 control register is used to control the operation of the SQW/OUT pin.

BIT 7

OUT

BIT 6

0

BIT 5

0

BIT 4

SQWE

BIT 3

0

BIT 2

0

BIT 1

RS1

BIT 0

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

0

0

1

1

X

X

RS0

0

1

0

1

X

X

SQW/OUT OUTPUT

1Hz

4.096kHz

8.192kHz

32.768kHz

0

1

SQWE

1

1

1

1

0

0

OUT

X

X

X

X

0

1

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