tea5766uk NXP Semiconductors, tea5766uk Datasheet - Page 29

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

NXP Semiconductors
TEA5766UK_1
Product data sheet
9.4.2 Modified Mobile Broadcast Service (MMBS) mode
9.4.3 Data overflow
9.5 RDS flag behavior during read action
There are three synchronization modes, RDS, RBDS and MMBS.
MMBS mode can be selected using bit MMBS in register TESTREG (see
During synchronization after RDS data is read from the registers, new available blocks are
shifted to the registers as described in
not read in time, the decoder cannot shift any new available block to the registers and
hence a data overflow will occur; this is indicated by the DOVF bit which is set to logic 1.
The DOVF bit is reset by a read of the registers or if NWSY = 1 which results in the start of
a new synchronization search.
Each time when an RDS data block is decoded the DAVN signal will go LOW to signal the
presence of a new data block. Also the DAVN signal triggers the interrupt output INTX. In
principle the microprocessor must now start reading and must have read all RDS data, so
byte 12R to byte 19R before the arrival of a new RDS data block. In the application there
can be a too large delay between the arrival of a new block and reading this block. This
can have various causes such as a microprocessor which has to start up from Sleep
mode or when polling is used instead of interrupt based read actions.
the behavior of the DAVFLG and the DAVN signal when polling, which effectively means
that reading can occur at any moment.
Remark: DAVN sets the INTX one-shot generator when DAVMSK = 1. Unlike INTX,
DAVN is not cleared by a read of the mask register.
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•
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RDS mode: the decoder can read A, B, C and D blocks and synchronize on A, B, C
and D blocks.
RBDS mode: the decoder can read A, B, C, D and E blocks and synchronize on A, B,
C and D blocks.
MMBS mode: the decoder can read A, B, C, D and E blocks and synchronize on A, B,
C, D and E blocks.
Rev. 01 — 22 March 2007
Section 9.1
to
Section
9.3. When the registers are
TEA5766UK
Stereo FM radio + RDS
Figure 13
© NXP B.V. 2007. All rights reserved.
Table
describes
19).
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