tea5766uk NXP Semiconductors, tea5766uk Datasheet - Page 22

• Manufacturer Part Number: tea5766uk
• Description: Tea5766uk Stereo Fm Radio + Rds
• Manufacturer: NXP Semiconductors

NXP Semiconductors
9. RDS data processing
TEA5766UK_1
Product data sheet
9.1 DAV-A processing mode
The RDS demodulator and decoder perform the following operations:
The RDS decoder can be set in different modes, each meant to look for specific
information. The modes DAV-A, DAV-B and DAV-C are described in the next paragraphs.
The DAV-A processing mode is the standard processing mode. In this mode each time
when a data block has been decoded it is transferred to the bus registers. It generates
interrupts on the INTX line after every new block of RDS data that has been processed
and also the DAVFLG is set. This is shown in
the bus registers.
Fig 8. Interrupt line behavior
•
•
•
•
•
•
•
•
Demodulation of the RDS/RBDS data stream from the MPX signal
Symbol decoding
Obtain block and group synchronization
Error detection and correction
Store last and previous data block received with associated ID and error status
Set the DAVFLG when new data is received
Set the SYNC status bit according to the current synchronization state
Set the LSYNCFL flag when synchronization is lost
V
interrupt event
flag A
flag B
INTX
read INTMSK
write INTMSK
(1) Flag is set immediately after the reset, because event is still present.
(2) When flag is set next interrupts are blocked until read or write INTMSK.
(3) When flag A is set, the interrupt is not extended beyond 10 ms.
(4) Read INTMSK clears flag, INTMSK and INTX.
(5) Write INTMSK enables INTX.
CC
(1)
(1)
(4)
(5)
Rev. 01 — 22 March 2007
(2)
10 ms
read clears INTX
10 ms
Figure
9. The DAVFLG is reset by a read of
10 ms
TEA5766UK
Stereo FM radio + RDS
© NXP B.V. 2007. All rights reserved.
(3)
001aaf446
10 ms
21 of 59