STV8216 datasheet(63/97 Pages) STMICROELECTRONICS

63 / 97 page

63/97

STV82x6

2 A mute of the corresponding audio output is recommended before changing the language. Any

audio discontinuity might create annoying audible plop.

PEAK_DET_CTRL

Peak Level Detector Control Register

PEAK_DET_STATL

Peak Level Detector Status Register

Address (hex): 4Bh

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0000

PD_SEL[1:0]

Bit Name

Reset

Function

Bits[7:2]

000000 Reserved.

PD_SEL[1:0]

Peak Level Detector Source Selection

00: FM

10: SCART

01: NICAM

11: I²S

Address (hex): 4Ch

Type: R

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PEAK_LEVEL_LEFT[7:0]

Bit Name

Reset

Function

PEAK_LEVEL_

LEFT[7:0]

00000000

Displays the Absolute Peak Level of the audio source selected. The measured value is

updated continuously every 64 ms. The range varies linearly from the full scale (0 dB) down to 1/

256 of the full scale (-48 dB).

In AM/FM Mono mode, only the PEAK_LEVEL_LEFT[7:0] value must be taken into account.

In FM Mono mode, the audio peak level range depends upon the programmed FM bandwidth.

The unique difference is that the measurement is done after Sound pre-processing (DC offset

removal, Prescaling, De-emphasis and Dematrixing).

In FM Stereo mode, the maximum value may be used to check if the incoming signal level is

correctly adjusted by the prescaling factor or if there are no FM overmodulation problems

(clipping).

Programmable values are listed in Table 19.

The difference between the PEAK_LEVEL_LEFT[7:0] and PEAK_LEVEL_RIGHT[7:0] values

may be calculated by the microcontroller to identify Mono or Stereo mode from an unknown

source (SCART or I²S).

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