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PCF8564AU/5GB/1 데이터시트(PDF) 19 Page - NXP Semiconductors

부품명 PCF8564AU/5GB/1
상세설명  Real time clock and calendar
PDF  44 Pages
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제조업체  NXP [NXP Semiconductors]
홈페이지  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8564AU/5GB/1 데이터시트(HTML) 19 Page - NXP Semiconductors

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PCF8564A_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 1 — 8 October 2009
19 of 44
NXP Semiconductors
PCF8564A
Real time clock and calendar
[1]
F0 is clocked at 32.768 kHz.
The first increment of the time circuits is between 0.507813 s and 0.507935 s after STOP
bit is released. The uncertainty is caused by the prescaler bits F0 and F1 not being reset
(see Table 26) and the unknown state of the 32 kHz clock.
8.11 Reset
The PCF8564A includes an internal reset circuit which is active whenever the oscillator is
stopped. In the reset state the I2C-bus logic is initialized including the address pointer and
all registers are set according to Table 27. I2C-bus communication is not possible during
reset.
Table 26.
First increment of time circuits after STOP bit release
Bit
Prescaler bits
[1]
1 Hz tick
Time
Comment
STOP
F0F1-F2 to F14
hh:mm:ss
Clock is running normally
0
01-0 0001 1101 0100
12:45:12
prescaler counting normally
STOP bit is activated by user. F0F1 are not reset and values cannot be predicted externally
1
XX-0 0000 0000 0000
12:45:12
prescaler is reset; time circuits are frozen
New time is set by user
1
XX-0 0000 0000 0000
08:00:00
prescaler is reset; time circuits are frozen
STOP bit is released by user
0
XX-0 0000 0000 0000
08:00:00
prescaler is now running
XX-1 0000 0000 0000
08:00:00
-
XX-0 1000 0000 0000
08:00:00
-
XX-1 1000 0000 0000
08:00:00
-
:
::
11-1 1111 1111 1110
08:00:00
-
00-0 0000 0000 0001
08:00:01
0 to 1 transition of F14 increments the time circuits
10-0 0000 0000 0001
08:00:01
-
:
::
11-1 1111 1111 1111
08:00:01
-
00-0 0000 0000 0000
08:00:01
-
10-0 0000 0000 0000
08:00:01
-
:
:-
11-1 1111 1111 1110
08:00:01
-
00-0 0000 0000 0001
08:00:02
0 to 1 transition of F14 increments the time circuits
013aaa076



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