pcf2127a NXP Semiconductors, pcf2127a Datasheet - Page 28

• Manufacturer Part Number: pcf2127a
• Description: Integrated Rtc, Tcxo And Quartz Crystal
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF2127A_1
Product data sheet
8.9.1 Register Seconds
8.9.2 Register Minutes
8.9 Time and date function
The majority of these registers are coded in the Binary Coded Decimal (BCD) format.
Table 19.
[1]
Table 20.
Table 21.
Bit
7
6 to 4 SECONDS
3 to 0
Seconds value in
decimal
00
01
02
:
09
10
:
58
59
Bit
7
6 to 4 MINUTES
3 to 0
Start-up value.
Symbol
OSF
Symbol
-
Seconds - seconds and clock integrity register (address 03h) bit description
Seconds coded in BCD format
Minutes - minutes register (address 04h) bit description
Upper-digit (ten’s place)
Bit 6
0
0
0
:
0
0
:
1
1
Rev. 01 — 21 January 2010
Value
0
1
0 to 5
0 to 9
Value
-
0 to 5
0 to 9
[1]
Bit 5
0
0
0
:
0
0
:
0
0
Place value Description
-
-
ten’s place
unit place
Place value Description
-
ten’s place
unit place
Bit 4
0
0
0
:
0
1
:
1
1
Integrated RTC, TCXO and quartz crystal
Digit (unit place)
Bit 3
0
0
0
:
1
0
:
1
1
clock integrity is guaranteed
clock integrity is not guaranteed:
actual seconds coded in BCD format
unused
actual minutes coded in BCD format
oscillator has stopped and chip reset
has occurred since flag was last cleared
Bit 2
0
0
0
:
0
0
:
0
0
PCF2127A
Bit 1
0
0
1
:
0
0
:
0
0
© NXP B.V. 2010. All rights reserved.
0
1
0
1
0
0
1
Bit 0
:
:
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