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PCA2125 Datasheet(PDF) 5 Page - NXP Semiconductors

Part # PCA2125
Description  SPI Real-time clock/calendar
Download  36 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA2125 Datasheet(HTML) 5 Page - NXP Semiconductors

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PCA2125_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 28 July 2008
5 of 36
NXP Semiconductors
PCA2125
SPI Real-time clock/calendar
[2]
Ten’s place in 24 h mode.
8.2 Reset
The PCA2125 includes an internal reset circuit which is active whenever the oscillator is
stopped; see Figure 3. The oscillator can be stopped, for example, by connecting one of
the oscillator pins OSCI or OSCO to ground.
The oscillator is considered to be stopped during the time between power-up and stable
crystal resonance; see Figure 4. This time can be in the range 200 ms to 2 s depending
on crystal type, temperature and supply voltage. Whenever an internal reset occurs, the
reset flag bit RF is set.
Fig 3.
Reset system
Fig 4.
Power-on reset
Table 5.
Register reset value
Bits labeled ‘-’ are not implemented and will return a ‘0’ when read. Bits labeled ‘X’ are undefined at
power-up and unchanged by subsequent resets.
Address
Register name
Bit
7
6
5
4
3
2
1
0
00h
Control_1
0
0
0
-
1
0
-
-
01h
Control_2
00000000
02h
Seconds
1
XXXXXXX
03h
Minutes
-
XXXXXXX
04h
Hours
-
-
XXXXXX
05h
Days
-
-
XXXXXX
06h
Weekdays
-----
X
X
X
001aaf898
SDI
CE
0 = override inactive
0 = clear override mode
0 = stopped, 1 = running
osc stopped
1 = override active
1 = override possible
CLEAR
POR
OVERRIDE
Bit
POR_OVRD
OSCILLATOR
reset
001aaf897
chip in reset
chip not in reset
t
VDD
oscillation
internal
reset


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