PCF85363ATLSLASHA datasheet(11/86 Pages) NXP

11 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

Upper-digit (ten’s place)

Digit (unit place)

Value in

decimal

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Table 8. BCD coding

7.2.2 OS: Oscillator stop

When the oscillator of the PCF85363A 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 8). 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.

aaa-009576

OS = 1 and bit can not be cleared

VDD

oscillation

oscillation now stable

OS bit cleared

by software

OS bit set when

oscillation stops

OS flag

OS = 1 and bit can be cleared

Figure 8. OS status bit

7.2.3 EMON: event monitor

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

Section 7.14. 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 21 for a pictorial representation.

PCF85363A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 18 June 2021

11 / 86

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