PCF212311 데이터 시트보기 (PDF) - NXP Semiconductors.

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PCF212311

SPI Real time clock/calendar

NXP Semiconductors. 

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

OS = 1 and flag can not be cleared

VDD

OS = 1 and flag can be cleared

oscillation

OS flag

OS flag cleared

by software

oscillation now stable

OS flag set when

oscillation stops

t

001aai553

Fig 9. OS flag

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

Table 10. Minutes - minutes register (address 03h) bit description

Bit

Symbol

Value

Place value Description

7

-

-

-

unused

6 to 4 MINUTES

3 to 0

0 to 5

0 to 9

ten’s place actual minutes coded in BCD

unit place format

8.4.3 Register Hours

Table 11. Hours - hours register (address 04h) bit description

Bit

Symbol

Value

Place value Description

7 to 6 -

-

-

unused

12 hour mode[1]

5

AMPM

0

-

indicates AM

1

-

indicates PM

4

HOURS

3 to 0

0 to 1

0 to 9

ten’s place actual hours in 12 hour mode

unit place coded in BCD format

24 hour mode[1]

5 to 4 HOURS

3 to 0

0 to 2

0 to 9

ten’s place actual hours in 24 hour mode

unit place coded in BCD format

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

PCF2123

Product data sheet

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

Rev. 5 — 27 April 2011

© NXP B.V. 2011. All rights reserved.

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