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PCF8563 Datasheet(PDF) 5 Page - NXP Semiconductors

Part # PCF8563
Description  Real-time clock/calendar
Download  30 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8563 Datasheet(HTML) 5 Page - NXP Semiconductors

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Philips Semiconductors
PCF8563
Real-time clock/calendar
Product specification
16 April 1999
5 of 30
9397 750 04855
© Philips Electronics N.V. 1999. All rights reserved.
8.4 Reset
The PCF8563 includes an internal reset circuit which is active whenever the oscillator
is stopped. In the reset state the I2C-bus logic is initialized and all registers, including
the address pointer, are cleared with the exception of bits FE, VL, TD1, TD0, TESTC
and AE which are set to logic 1.
8.5 Voltage-low detector and clock monitor
The PCF8563 has an on-chip voltage-low detector. When VDD drops below Vlow the
VL bit (Voltage Low, bit 7 in the Seconds register) is set to indicate that reliable
clock/calendar information is no longer guaranteed. The VL flag can only be cleared
by software.
The VL bit is intended to detect the situation when VDD is decreasing slowly for
example under battery operation. Should VDD reach Vlow before power is re-asserted
then the VL bit will be set. This will indicate that the time may be corrupted.
8.6 Register organization
Fig 4.
Voltage-low detection.
handbook, halfpage
VL set
normal power
operation
period of battery
operation
t
VDD
Vlow
MGR887
Table 4:
Registers overview
Bit positions labelled as ‘
−’are not implemented; those labelled with ‘0’ should always be written with logic 0.
Address Register name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
00H
Control/Status 1
TEST1
0
STOP
0
TESTC
0
0
0
01H
Control/Status 2
0
0
0
TI/TP
AF
TF
AIE
TIE
0DH
CLKOUT frequency
FE
−−−−−
FD1
FD0
0EH
Timer control
TE
−−−−−
TD1
TD0
0FH
Timer countdown
value
<timer countdown value>


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