PCF85263ATT/AJ View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
PCF85263ATT/AJ
NXP Semiconductors.
'PCF85263ATT/AJ' PDF : 100 Pages View PDF
NXP Semiconductors
PCF85263A
Tiny RTC with alarm, battery switch-over, and I2C-bus
Table 9.
Value in
decimal
00
01
02
:
09
10
:
98
99
BCD coding
Upper-digit (ten’s place)
Bit 7 Bit 6 Bit 5
0
0
0
0
0
0
0
0
1
:
:
:
1
0
0
0
0
0
:
:
:
1
0
0
1
0
0
Bit 4
0
1
0
:
1
0
:
1
1
Digit (unit place)
Bit 3 Bit 2
0
0
0
0
0
0
:
:
1
0
0
0
:
:
1
0
1
0
Bit 1
0
0
1
:
0
0
:
0
0
Bit 0
0
1
0
:
1
0
:
0
1
8.2.2 OS: Oscillator stop
When the oscillator of the PCF85263A is stopped, the OS status bit is set. 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-on and
stable crystal resonance. This time can be in the range of 200 ms to 2 s depending on
crystal type, temperature, and supply voltage.
The status bit remains set until cleared by command (see Figure 9). If the bit cannot be
cleared, then the oscillator is not running. This method can be used to monitor the
oscillator and to determine if the supply voltage has reduced to the point where oscillation
fails.
26 DQGELWFDQQRWEHFOHDUHG
9''
26 DQGELWFDQEHFOHDUHG
RVFLOODWLRQ
26IODJ
Fig 9. OS status bit
26ELWFOHDUHG
E\VRIWZDUH
RVFLOODWLRQQRZVWDEOH
26ELWVHWZKHQ
RVFLOODWLRQVWRSV
W
DDD
8.2.3 EMON: event monitor
The EMON can be used to monitor the status of all the flags in the Flags register, see
Section 8.14 on page 57. When one or more of the flags is set, then the EMON bit returns
a logic 1. The EMON bit cannot be cleared. EMON returns a logic 0 when all flags are
cleared.
See Figure 22 on page 41 for a pictorial representation.
PCF85263A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4.1 — 27 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
15 of 100
Share Link: 