PCF85263ATLSLASHA datasheet(15/100 Pages) NXP

15 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

15 of 100

NXP Semiconductors

PCF85263A

Tiny RTC with alarm, battery switch-over, and I2C-bus

8.2.2 OS: Oscillator stop

When the oscillator of the PCF85263A is stopped, the OS status bit 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 status bit remains set until cleared by command (see Figure 9). If the bit 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.

8.2.3 EMON: event monitor

The EMON can be used to monitor the status of all the flags in the Flags register, see

Section 8.14 on page 57. When one or more of the flags is set, then the EMON bit returns

a logic 1. The EMON bit cannot be cleared. EMON returns a logic 0 when all flags are

cleared.

See Figure 22 on page 41 for a pictorial representation.

Table 9.

BCD coding

Value in

decimal

Upper-digit (ten’s place)

Digit (unit place)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

000

100

001

000

:::

100

110

000

:::

100

110

100

110

Fig 9.

OS status bit

PCF85263ATL/A Datasheet(PDF) 15 Page - NXP Semiconductors

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