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PCF2127AT/1 bảng dữ liệu(PDF) 29 Page - NXP Semiconductors

tên linh kiện PCF2127AT/1
Giải thích chi tiết về linh kiện  Integrated RTC, TCXO and quartz crystal
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PCF2127AT/1 bảng dữ liệu(HTML) 29 Page - NXP Semiconductors

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PCF2127A_2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
29 of 80
NXP Semiconductors
PCF2127A
Integrated RTC, TCXO and quartz crystal
8.9.3 Register Hours
[1]
Hour mode is set by the bit 12_24 in register Control_1.
8.9.4 Register Days
[1]
The RTC compensates for leap years by adding a 29th day to February if the year counter contains a value
which is exactly divisible by 4, including the year 00.
8.9.5 Register Weekdays
Although the association of the weekdays counter to the actual weekday is arbitrary, the
PCF2127A will assume Sunday is 000 and Monday is 001 for the purposes of determining
the increment for calendar weeks.
[1]
These bits may be re-assigned by the user.
Table 22.
Hours - hours register (address 05h) bit description
Bit
Symbol
Value
Place value Description
7to6 -
-
-
unused
12 hour mode[1]
5
AMPM
0
-
indicates AM
1
-
indicates PM
4
HOURS
0 to 1
ten’s place
actual hours coded in BCD format when in
12 hour mode
3to0
0to9
unit place
24 hour mode[1]
5 to 4 HOURS
0 to 2
ten’s place
actual hours coded in BCD format when in
24 hour mode
3to0
0to9
unit place
Table 23.
Days - days register (address 06h) bit description
Bit
Symbol
Value
Place value Description
7to6 -
-
-
unused
5to4 DAYS[1]
0 to 3
ten’s place
actual day coded in BCD format
3to0
0to9
unit place
Table 24.
Weekdays - weekdays register (address 07h) bit description
Bit
Symbol
Value
Description
7to3 -
-
unused
2 to 0 WEEKDAYS
0 to 6
actual weekday value, see Table 25
Table 25.
Weekday assignments
Day[1]
Bit
2
1
0
Sunday
0
0
0
Monday
0
0
1
Tuesday
0
1
0
Wednesday
0
1
1
Thursday
1
0
0
Friday
1
0
1
Saturday
110



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