PCA2125TS/1-T NXP Semiconductors, PCA2125TS/1-T Datasheet - Page 18

• Manufacturer Part Number: PCA2125TS/1-T
• Description: Real Time Clock AUTO RL TME CLCK/CAL
• Manufacturer: NXP Semiconductors

Specifications of PCA2125TS/1-T

• Bus Type: Serial (3-Wire, SPI)
• Package Type: TSSOP
• Operating Supply Voltage (max): 5.5V
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-14
• Lead Free Status / RoHS Status: Compliant
• Other names: PCA2125TS/1,118

NXP Semiconductors
PCA2125_1
Product data sheet
Fig 11. Interrupt scheme
COUNTDOWN COUNTER
When bits SI, MI, TIE and AIE are all disabled, pin INT will remain high-impedance.
SECONDS COUNTER
MINUTES COUNTER
8.7.1 Minute and second interrupts
TE
Remark: Note that the interrupts from the three groups are wired-OR, meaning they will
mask one another; see
The pulse generator for the minute/second interrupt operates from an internal 64 Hz clock
and consequently generates a pulse of
If the MSF flag is clear before the end of the INT pulse, then the INT pulse is shortened.
This allows the source of a system interrupt to be cleared immediately it is serviced i.e.
the system does not have to wait for the completion of the pulse before continuing; see
Figure
from interface:
from interface:
from interface:
12. Instructions for clearing MSF are given in
clear MSF
set alarm
clear AF
clear TF
flag, AF
MI
SI
SET
SET
SET
SECOND FLAG
MSF: MINUTE
AF: ALARM
TF: TIMER
CLEAR
CLEAR
CLEAR
Rev. 01 — 28 July 2008
Figure
FLAG
11.
TRIGGER
TRIGGER
GENERATOR 1
GENERATOR 2
1
PULSE
CLEAR
PULSE
CLEAR
to interface:
read MSF
to interface:
read TF
to interface:
read AF
64
second duration.
TI_TP
Section
0
1
0
1
SPI Real-time clock/calendar
8.6.3.
SI
AIE
TIE
MI
PCA2125
© NXP B.V. 2008. All rights reserved.
001aaf907
INT
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