PCF85063TP datasheet(17/46 Pages) NXP

17 / 46 page

PCF85063TP

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Product data sheet

Rev. 2 — 15 April 2013

17 of 46

NXP Semiconductors

PCF85063TP

Tiny Real-Time Clock/calendar

[1]

Default value.

8.3.1.1

OS: Oscillator stop

When the oscillator of the PCF85063TP is stopped, the OS flag is set. The oscillator can

be stopped, for example, by connecting one of the oscillator pins OSCI or OSCO to

ground. The oscillator is considered to be stopped during the time between power-on and

stable crystal resonance. This time can be in the range of 200 ms to 2 s depending on

crystal type, temperature, and supply voltage.

The flag remains set until cleared by command (see Figure 10). If the flag cannot be

cleared, then the oscillator is not running. This method can be used to monitor the

oscillator and to determine if the supply voltage has reduced to the point where oscillation

fails.

Table 20.

Seconds coded in BCD format

Seconds value in

decimal

Upper-digit (ten’s place)

Digit (unit place)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00[1]

000

0000

000

0001

000

0010

:::

::::

000

1001

001

0000

:::

::::

101

1000

101

1001

Fig 10. OS flag

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