PCF2123TS datasheet(13/63 Pages) NXP

13 / 63 page

PCF2123

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Product data sheet

Rev. 5 — 27 April 2011

13 of 63

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

The oscillator may be stopped, for example, by grounding one of the oscillator pins, OSCI

or OSCO. The oscillator is also considered to be stopped during the time between

power-on and stable crystal resonance. This time may be in the range of 200 ms to 2 s

depending on crystal type, temperature and supply voltage. At power-on the OS flag is

always set.

8.4.2 Register Minutes

8.4.3 Register Hours

[1]

Hour mode is set by the 12_24 bit in register Control_1.

Fig 9.

OS flag

001aai553

OS = 1 and flag can not be cleared

OS = 1 and flag can be cleared

OS flag cleared

by software

OS flag set when

oscillation stops

oscillation now stable

VDD

oscillation

OS flag

Table 10.

Minutes - minutes register (address 03h) bit description

Bit

Symbol

Value

Place value Description

unused

6 to 4

MINUTES

0 to 5

ten’s place

actual minutes coded in BCD

format

3 to 0

0 to 9

unit place

Table 11.

Hours - hours register (address 04h) bit description

Bit

Symbol

Value

Place value Description

7 to 6

unused

12 hour mode[1]

AMPM

indicates AM

indicates PM

HOURS

0 to 1

ten’s place

actual hours in 12 hour mode

coded in BCD format

3to0

0to 9

unit place

24 hour mode[1]

5 to 4

HOURS

0 to 2

ten’s place

actual hours in 24 hour mode

coded in BCD format

3to0

0to 9

unit place

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