TDA7546 datasheet(51/68 Pages) STMICROELECTRONICS

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TDA7546

Software specifications

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Table 37.

rds_int register

Table 38.

rds_qu register

(1) If the interrupt source is changed form block A, B,

D, TA, TA EON to another one "no interrupt" must be

set before to clear the previous interrupt acknowledge.

Interrupt bit. It is set to one on every programmed interrupt. It is

reset by reading rds_int register. The inverted version is also

externally available on RDSINT pin.

itsrc[2:0] selects interrupt source (1).

Block A, B, D and TA, TA EON interrupts only if "synch" =1.

Synchronization information (refer to pages 28-29).

1: The module is already synchronized.

0: The module is synchronizing.

It is used to force a resynchronization. If it is set to one, the RDS

modules are forced to resynchronization state and the RAM buffer

address is reset.

This bit is reset automatically. It is read always as zero.

Buffer not empty.

1: At least one block is present in the RAM buffer.

0: The RAM buffer is empty.

rds_int, rds_bd_ctrl and pllreg4-0 write order.

This bit is only used in SPI mode and is read always as zero.

1: Update of rds_int, rds_bd_ctrl and pllreg4-0 with data shifted in.

0: No update of rds_int, rds_bd_ctrl and pllreg4-0.

bit name

access

bit 7

bit 0

bit 1

bit 2

bit 3

bit 4

bit 5

bit 6

r/w

itsrc0

int

ar_res

bne

itsrc1

synch

write

reset value

itsrc2

(1)

itsrc2

itsrc1

interrupt source

itsrc0

buffer not empty

block B

block A

buffer full

block D

TA EON

no interrupt

rds_int

(2) If "syncw" =1 of rds_bd_ctrl register, the block counter in-

dicates the expected RDS block.

(3) qu[3...0] counts the number of bits (max.16) which are

marked as bad by the demodulator within each RDS block.

It could be used as a quality information, indicating the max-

imum number of bits which are allowed to be corrected.

It indicates if error correction was successful.

1: The syndrome was zero after error correction.

0: The syndrome did not become zero and therefore the error

correction was not successful.

1: Block E is detected. This indicates a paging block which is

deÞned in the RBDS speciÞcation used in the United States of

America.

0: An ordinary RDS block A, B, C, C« or D is detected, or no valid

syndrome was found.

Bit 0 of block counter (2).

bit 1 of block counter (2).

bit 0 of quality counter (3).

bit 1 of quality counter (3).

bit 2 of quality counter (3).

bit 3 of quality counter (3).

bit name

access

bit 7

bit 0

bit 1

bit 2

bit 3

bit 4

bit 5

bit 6

rrr

synz

qu0

qu3

qu1

qu2

blk1

blk0

blk1

blk0

block A

block name

block D

block C,C'

block B

(2)

reset value

rds_qu

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