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PCF2127AT/1 Datasheet(PDF) 30 Page - NXP Semiconductors

Part # PCF2127AT/1
Description  Integrated RTC, TCXO and quartz crystal
PDF  80 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2127AT/1 Datasheet(HTML) 30 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
30 of 80
NXP Semiconductors
PCF2127A
Integrated RTC, TCXO and quartz crystal
8.9.6 Register Months
8.9.7 Register Years
8.9.8 Setting and reading the time
Figure 17 shows the data flow and data dependencies starting from the 1 Hz clock tick.
During read/write operations, the time counting circuits (memory locations 03h through
09h) are blocked.
This prevents
• Faulty reading of the clock and calendar during a carry condition
• Incrementing the time registers during the read cycle
Table 26.
Months - months register (address 08h) bit description
Bit
Symbol
Value
Place value Description
7to5 -
-
-
unused
4
MONTHS
0 to 1
ten’s place
actual month coded in BCD format, see
Table 27
3to0
0to9
unit place
Table 27.
Month assignments in BCD format
Month
Upper-digit
(ten’s place)
Digit (unit place)
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
January
0
0
0
0
1
February
0
0
0
1
0
March
0
0
0
1
1
April
0
0
100
May
0
0
101
June
00
110
July
00
111
August
01
000
September
0
1
0
0
1
October
10
000
November
10
001
December
10
010
Table 28.
Years - years register (address 09h) bit description
Bit
Symbol
Value
Place value Description
7 to 4 YEARS
0 to 9
ten’s place
actual year coded in BCD format
3to0
0to9
unit place



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