PCF8523 NXP [NXP Semiconductors], PCF8523 Datasheet - Page 20

• Manufacturer Part Number: PCF8523
• Description: Real-Time Clock (RTC) and calendar
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8523
Product data sheet
8.6.2 Register Minutes
8.6.3 Register Hours
8.6.4 Register Days
Table 12.
Table 13.
[1]
Table 14.
[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
Bit
7 to 6
5 to 4
3 to 0
Fig 12. OS flag
oscillation
Hour mode is set by bit 12_24 in register Control_1 (see
The PCF8523 compensates for leap years by adding a 29
value, which is exactly divisible by 4, including the year 00.
OS flag
V
DD
Symbol
-
MINUTES
Symbol
-
AMPM
HOURS
HOURS
Symbol
-
DAYS
Minutes - minutes register (address 04h) bit description
Hours - hours register (address 05h) bit description
Days - days register (address 06h) bit description
[1]
[1]
[1]
All information provided in this document is subject to legal disclaimers.
OS = 1 and flag can not be cleared
Rev. 3 — 30 March 2011
Value
-
0 to 5
0 to 9
Value
-
0
1
0 to 1
0 to 9
0 to 2
0 to 9
Value
-
0 to 3
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
Place value Description
-
ten’s place
unit place
OS = 1 and flag can be cleared
Table
Real-Time Clock (RTC) and calendar
th
day to February if the year counter contains a
OS flag cleared
by software
5).
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
unused
actual day coded in BCD format
PCF8523
© NXP B.V. 2011. All rights reserved.
OS flag set when
oscillation stops
013aaa319
t
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