PCF2123BS/1 NXP Semiconductors, PCF2123BS/1 Datasheet - Page 13

• Manufacturer Part Number: PCF2123BS/1
• Manufacturer: NXP Semiconductors

Specifications of PCF2123BS/1

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF2123
Product data sheet
8.4.2 Register Minutes
8.4.3 Register Hours
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.
Table 10.
Table 11.
[1]
Bit
7
6 to 4
3 to 0
Bit
7 to 6
12 hour mode
5
4
3 to 0
24 hour mode
5 to 4
3 to 0
Fig 9.
oscillation
OS flag
Hour mode is set by the 12_24 bit in register Control_1.
V
DD
Symbol
-
MINUTES
Symbol
-
AMPM
HOURS
HOURS
OS flag
Minutes - minutes register (address 03h) bit description
Hours - hours register (address 04h) bit description
[1]
[1]
All information provided in this document is subject to legal disclaimers.
OS = 1 and flag can not be cleared
Rev. 5 — 27 April 2011
Value
-
0 to 5
0 to 9
Value
-
0
1
0 to 1
0 to 9
0 to 2
0 to 9
oscillation now stable
Place value Description
-
ten’s place
unit place
Place value Description
-
-
-
ten’s place
unit place
ten’s place
unit place
OS = 1 and flag can be cleared
OS flag cleared
by software
unused
actual minutes coded in BCD
format
unused
indicates AM
indicates PM
actual hours in 12 hour mode
coded in BCD format
actual hours in 24 hour mode
coded in BCD format
SPI Real time clock/calendar
PCF2123
© NXP B.V. 2011. All rights reserved.
OS flag set when
oscillation stops
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