STV82X6 datasheet(53/95 Pages) STMICROELECTRONICS

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STV82x6

CAROFFSET2

Channel 2 DCO Carrier Offset Compensation

9.8

NICAM Registers

NICAM_CTRL

NICAM Decoder Control Register

Address (hex): 3Ah

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CAROFFSET2[7:0] (S)

Bit Name

Reset

Function

CAROFFSET2

[7:0]

00000000

This value is used to correct the carrier frequency offset of the incoming IF signal. Automatic

frequency control in FM mode can be implemented by registers FM_DCR and FM_DCL.

A DCO frequency offset (in two’s complement format) is added to the pre-programming value

by AUTOTSD in the CARFQ2 registers (corresponding to the standard IF carrier frequency).

The programmable carrier offset ranges from -192 kHz to +190.5 kHz with a resolution of

1.5 kHz.

For standard FM deviation, the value displayed by register FM_DCR can be directly loaded in in

Address (hex): 3Dh

Type: R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

DIF_POL

ECT

MAE

Bit Name

Reset

Function

Bits[7:3]

00000

Reserved.

DIF_POL

0: No polarity inversion (Default)

1: Polarity inversion of the differential decoding

ECT

Error Counter Timer: Defines the NICAM error measurement period

0: 128 ms (Default)

1: 64 ms

MAE

Max. Allowed Errors. Defines the NICAM error decoding for mute function.

0: 511 Max (Default)

1: 255 Max

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