pca2125 NXP Semiconductors, pca2125 Datasheet - Page 22

• Manufacturer Part Number: pca2125
• Description: Spi Real Time Clock / Calendar Semiconductors
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA2125_00
Preliminary data sheet
6.7.3 Alarm interrupts
The timing shown for clearing TF in
mode i.e. when TI/TP = 0, where the pulse may be shortened by setting TIE to ‘0’.
Generation of interrupts from the alarm function is controlled via the AIE bit (see
If AIE is enabled, the INT pin follows the status of AF. Clearing AF will immediately clear
INT. No pulse generation is possible for alarm interrupts (see
Fig 14. Example of shortening the INT pulse by clearing the TF flag.
Fig 15. AF timing
Example where only the minute alarm is used and no other interrupts are enabled.
countdown counter
minute counter
minute alarm
instruction
instruction
Rev. 00.11 — 30 January 2007
SCL
INT
AF
SCL
INT
TF
44
45
01
45
n
Figure 14
CLEAR INSTRUCTION
CLEAR INSTRUCTION
is also valid for the non-pulsed interrupt
SPI Real time clock / calendar
8th clock
8th clock
Figure
001aaf910
15).
001aaf909
PCA2125
© NXP B.V. 2007. All rights reserved.
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