MSP4458 datasheet(34/85 Pages) MICRONAS

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MSP 44x8G

PRELIMINARY DATA SHEET

Micronas

3.4. Programming Tips

This section describes the preferred method for initial-

izing the MSP 44x8G. The initialization is grouped into

four sections:

– SCART Signal Path (analog signal path)

– Demodulator Input

– SCART and I2S Inputs

– Output Channels

See Fig. 2–1 on page 8 for a complete signal flow.

SCART Signal Path

1. Select analog input for the SCART baseband pro-

cessing (SCART DSP Input Select) by means of the

ACB register.

2. Select the source for each analog SCART output

(SCART Output Select) by means of the ACB regis-

ter.

Demodulator Input

For a complete setup of the sound processing from

analog IF input to the source selection, the following

steps must be performed:

1. Set MODUS register to the preferred mode and

Sound IF input.

2. Write STANDARD SELECT register.

3. Choose preferred prescale (FM and NICAM) values.

4. If Automatic Sound Select is not active:

Choose FM matrix repeatedly according to the

sound mode indicated in the STATUS register.

SCART and I2S Inputs

1. Select preferred prescale for SCART.

2. Select preferred prescale for I2S inputs

(set to 0 dB after RESET).

Output Channels

1. Select the source channel and matrix for each out-

put channel.

2. Set audio baseband features (i.e. AVC, 75

µs pre-

emphasis)

3. Select volume for each output channel.

3.5. Examples of Minimum Initialization Codes

Initialization of the MSP 44x8G according to these list-

ings reproduces sound of the selected standard on the

main output. All numbers are hexadecimal. The exam-

ples have the following structure:

1. Perform an I2C controlled reset of the IC.

2. Write MODUS register

(with Automatic Sound Select).

3. Set Source Selection for main channel

(with matrix set to STEREO).

4. Set Prescale

(FM and/or NICAM and dummy FM matrix).

5. Write STANDARD SELECT register.

6. Set Volume main channel to 0 dB.

3.5.1. B/G-FM (A2 or NICAM)

<800080 00>

// Softreset

<800000 00>

<801000 3020 03>

// MODUS-Register: Automatic = on

<801200 0803 20>

// Source Sel. = (St or A) & Ch. Matr. = St

<801200 0E 24 03>

// FM/AM-Prescale = 24hex,

FM-Matrix = MONO/SOUNDA

<801200 1000 5A>

// NICAM-Prescale = 5Ahex

<801000 2000 03>

// Standard Select: A2 B/G or NICAM B/G

<801000 2000 08>

<801200 0073 00>

// Main Volume 0 dB

3.5.2. BTSC-Stereo

<800080 00>

// Softreset

<800000 00>

<801000 3020 03>

// MODUS-Register: Automatic = on

<801200 0803 20>

// Source Sel. = (St or A) & Ch. Matr. = St

<801200 0E 24 03>

// FM/AM-Prescale = 24hex,

FM-Matrix = Sound A Mono

<801000 2000 20>

// Standard Select: BTSC-STEREO

<801200 0073 00>

// Main Volume 0 dB

3.5.3. BTSC-SAP with SAP at Main Channel

<800080 00>

// Softreset

<800000 00>

<801000 3020 03>

// MODUS-Register: Automatic = on

<801200 0804 20>

// Source Sel. = (St or B) & Ch. Matr. = St

<801200 0E 24 03>

// FM/AM-Prescale = 24hex,

FM-Matrix = Sound A Mono

<801000 2000 21>

// Standard Select: BTSC-SAP

<801200 0073 00>

// Main Volume 0 dB

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