PCF8523 Datasheet, PDF (42/66 Pages) NXP Semiconductors – Real-Time Clock (RTC) and calendar

NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
Table 43. First increment of time circuits after stop release
Bit
Prescaler bits^[1]
1 Hz tick Time
Comment
STOP F₀F₁-F₂ to F₁₄
Clock is running normally
hh:mm:ss
0
01-0000111010100
12:45:12
prescaler counting normally
STOP is activated by user; F₀F₁ are not reset and values cannot be predicted externally
1
XX-0000000000000
12:45:12
prescaler is reset; time circuits are frozen
New time is set by user
1
XX-0000000000000
08:00:00
prescaler is reset; time circuits are frozen
STOP is released by user
0
XX-0000000000000
08:00:00
prescaler is now running
0
XX-1000000000000
08:00:00
-
0
XX-0100000000000
08:00:00
-
0
XX-1100000000000
08:00:00
-
:
:
:
:
0
11-1111111111110
08:00:00
-
0
00-0000000000001
08:00:01
0 to 1 transition of F14 increments the time circuits
0
10-0000000000001
08:00:01
-
:
:
:
:
0
11-1111111111111
08:00:01
-
0
00-0000000000000
08:00:01
-
:
:
:
:
0
11-1111111111110
08:00:01
-
0
00-0000000000001
08:00:02
0 to 1 transition of F14 increments the time circuits
013aaa337
[1] F₀ is clocked at 32.768 kHz.
PCF8523
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 30 March 2011
© NXP B.V. 2011. All rights reserved.
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