DS1339AU+【PDF 4/19 页】IC RTC I2C W/ALARM 8USOP

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DS1339A

Low-Current, I2C, Serial Real-Time Clock

Maxim Integrated

Control Register (0Eh)

The control register controls the operation of the SQW/INT pin and provides oscillator status.

Bit 7: Enable Oscillator (EOSC). When the EOSC bit is 0, the oscillator is enabled. When this bit is a 1, the oscillator

is disabled. This bit is cleared (0) when power is first applied.

Bit 5: Battery-Backed Square-Wave Interrupt (BBSQI). When set to logic 1, this bit enables the SQW/INT output

functionality while the part is powered by VBACKUP. When set to logic 0, this bit disables the SQW/INT output while the

part is powered by VBACKUP.

Bits 4 and 3: Rate Select (RS2 and RS1). These bits control the frequency of the SQW/INT output when the square-

wave has been enabled (INTCN=0). Table 5 lists the square-wave frequencies that can be selected with the RS bits.

Bit 2: Interrupt Control (INTCN). This bit controls the relationship between the two alarms and the interrupt output pin.

When the INTCN bit is set to logic 1, a match between the timekeeping registers and the Alarm 1 or Alarm 2 registers

activate the SQW/INT pin (provided that the alarm is enabled). When the INTCN bit is set to logic 0, a square wave is

output on the SQW/INT pin. This bit is set to logic 0 when power is first applied.

Bit 1: Alarm 2 Interrupt Enable (A2IE). When set to a logic 1, this bit permits the Alarm 2 Flag (A2F) bit in the status

does not initiate an interrupt signal. The A2IE bit is disabled (logic 0) when power is first applied.

Bit 0: Alarm 1 Interrupt Enable (A1IE). When set to logic 1, this bit permits the Alarm 1 Flag (A1F) bit in the status

does not initiate an interrupt signal. The A1IE bit is disabled (logic 0) when power is first applied.

Table 5. SQW/INT Output

INTCN

RS2

RS1

SQW/INT OUTPUT

A2IE

A1IE

1Hz

4.096kHz

8.192kHz

32.768kHz

A1F

A2F

A2F + A1F

Bit #

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

Name

EOSC

BBSQI

RS2

RS1

INTCN

A2IE

A1IE

POR

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