TDA5240 Datasheet, PDF (86/284 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5240
Functional Description
EMC Reduction of Digital I/Os:
Because electromagnetic distortion generated by digital I/Os may interfere with the high
sensitivity radio receiver, it is recommended that all inputs are filtered by adding an RC
low pass circuit.
2.5.4 Interrupt Generation Unit
The TDA5240 is able to signal interrupts (NINT signal) to the external Application
Controller on one of the PPx port pins (for further details see Chapter 2.5.3 Digital
Output Pins). The Interrupt Generation Unit receives all possible interrupts and sets the
NINT signal based on the configuration of the Interrupt Mask registers (IM0 and IM1).
The Interrupt Status registers (IS0 and IS1) are set from the Interrupt Generation Unit,
depending on which interrupt occurred. The polarity of the interrupt can be changed in
the PPCFG2 register. Please note that during power up and brownout reset, the polarity
of NINT signal is always as described in Chapter 2.4.9.2 Chip Reset.
A Reset event has the highest priority. It sets all bits in the Status registers to “1” and
sets the interrupt signal to “0”. The first interrupt after the Reset event will clear the Status
registers and will set the interrupt signal to “1”, even if this interrupt is masked.
A Wake-up interrupt clears the FsyncA, FsyncB, FsyncC, FsyncD and the
complementary Wake-up flag. An Fsync interrupt clears the EOMA, EOMB, EOMC,
EOMD, MIDA, MIDB, MIDC, MIDD and the complementary Fsync flags.
The Interrupt Status register is always cleared after read out via SPI.
It is not possible to disable the Power On Reset Indicator Interrupt using the Interrupt
Mask registers.
Some interrupts are not usable depending on the selected receive mode, which is
described in Chapter 2.5.1.2 Data Interface.
Interrupts for WU can be used in all receive modes.
Interrupts for FSync, MID and EOM can only be used in the receive modes POTP and
POF.
Data Sheet
86
V4.0, 2010-02-19