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PCF2123 数据表(PDF) 13 Page - NXP Semiconductors

部件名 PCF2123
功能描述  SPI Real time clock/calendar Time keeping application
PDF  63 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

PCF2123 数据表(HTML) 13 Page - NXP Semiconductors

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PCF2123
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
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
t
VDD
oscillation
OS flag
Table 10.
Minutes - minutes register (address 03h) bit description
Bit
Symbol
Value
Place value Description
7
-
-
-
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]
5
AMPM
0
-
indicates AM
1
-
indicates PM
4
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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