PCF2123BS/1 NXP Semiconductors, PCF2123BS/1 Datasheet - Page 25

• Manufacturer Part Number: PCF2123BS/1
• Manufacturer: NXP Semiconductors

Specifications of PCF2123BS/1

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF2123
Product data sheet
Fig 16. Interrupt scheme
COUNTDOWN COUNTER
When bits SI, MI, TIE, AIE, and CIE are all disabled, pin INT will remain high-impedance.
SECONDS COUNTER
MINUTES COUNTER
8.7 Interrupt output
TE
offset circuit: add/substract
An active LOW interrupt signal is available at pin INT. Operation is controlled via the bits
of register Control_2. Interrupts may be sourced from four places: second and minute
timer, countdown timer, alarm function or offset function.
With bit TI_TP, the timer generated interrupts can be configured to either generate a pulse
or to follow the status of the interrupt flags (bits TF and MSF). Correction interrupt pulses
are always
Remark: Note that the interrupts from the four sources are wired-OR, meaning they will
mask one another (see
from interface:
from interface:
from interface:
from interface:
1/64 Hz pulse
clear MSF
set alarm
clear TF
clear AF
flag, AF
set CIE
MI
SI
1
⁄
128
All information provided in this document is subject to legal disclaimers.
second long. Alarm interrupts always follow the condition of AF.
SET
SET
SET
SECOND FLAG
MSF: MINUTE
AF: ALARM
TF: TIMER
CLEAR
CLEAR
CLEAR
FLAG
Figure
Rev. 5 — 27 April 2011
16).
TRIGGER
TRIGGER
TRIGGER
GENERATOR 1
GENERATOR 2
GENERATOR 3
PULSE
CLEAR
PULSE
CLEAR
CLEAR
PULSE
to interface:
read MSF
to interface:
read TF
to interface:
read AF
TI_TP
0
1
0
1
SPI Real time clock/calendar
SI
CIE
TIE
AIE
MI
PCF2123
© NXP B.V. 2011. All rights reserved.
E.G.AIE
001aai555
INT
0
1
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