PCF2123TS/1.118 NXP Semiconductors, PCF2123TS/1.118 Datasheet - Page 28

• Manufacturer Part Number: PCF2123TS/1.118
• Manufacturer: NXP Semiconductors

Specifications of PCF2123TS/1.118

• Bus Type: Serial (3-Wire, SPI)
• Package Type: TSSOP
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
PCF2123
Product data sheet
8.7.3.1 Correction pulse interrupts
8.7.3 Alarm interrupts
The timing shown for clearing bit TF in
mode, i.e., when bit TI_TP = 0; INT may be shortened by setting bit TIE to logic 0.
The generation of interrupts from the alarm function is controlled via bit AIE (see
If bit AIE is enabled, the INT pin follows the condition of bit AF. Clearing bit AF will
immediately clear INT. No pulse generation is possible for alarm interrupts (see
Figure
Interrupt pulses generated by correction events can be shortened by writing logic 1 to bit
CIE in register Control_1.
Fig 18. Example of shortening the INT pulse by clearing the TF flag
Fig 19. AF timing
(1) Indicates normal duration of INT pulse (bit TI_TP = 1).
19).
Example where only the minute alarm is used and no other interrupts are enabled.
countdown counter
minute counter
All information provided in this document is subject to legal disclaimers.
minute alarm
instruction
instruction
SCL
CDTF
Rev. 03 — 5 October 2010
INT
AF
SCL
INT
44
45
01
45
n
Figure 18
CLEAR INSTRUCTION
CLEAR INSTRUCTION
is also valid for the non-pulsed interrupt
SPI Real time clock/calendar
8th clock
8th clock
001aaf910
001aaf909
PCF2123
© NXP B.V. 2010. All rights reserved.
(1)
Table
28 of 61
7).