DS1307+ Dallas Semiconductor, DS1307+ Datasheet - Page 9

• Manufacturer Part Number: DS1307+
• Description: Clock, Real Time; PDIP; 8 Pins; -0.5 to +7.0 V; 0.7 V (Max.); +0.8 V (Max.)
• Manufacturer: Dallas Semiconductor

Specifications of DS1307+

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

CONTROL REGISTER
The DS1307 control register is used to control the operation of the SQW/OUT pin.
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
BIT 7
OUT
X
X
0
0
1
1
RS0
X
X
0
1
0
1
BIT 6
0
SQW/OUT OUTPUT
BIT 5
32.768kHz
4.096kHz
8.192kHz
0
1Hz
0
1
SQWE
BIT 4
9 of 15
SQWE
BIT 3
1
1
1
1
0
0
0
DS1307 64 x 8, Serial, I
OUT
X
X
X
X
0
1
BIT 2
0
BIT 1
RS1
2
C Real-Time Clock
BIT 0
RS0