MSP3400CPP View Datasheet(PDF) - Micronas

Part Name

Description

Manufacturer

MSP3400CPP

Multistandard Sound Processor

Micronas 

PRELIMINARY DATA SHEET

MSP 3400C

6.3. Sequences to Transmit Parameters and to Start

Processing

After having been switched on, the MSPC must be ini-

tialized by transmitting the parameters according to the

LOAD_SEQ_1/2 of Table 6–12. In the MSPC, the initial-

ization sequence must no longer be terminated by trans-

mitting LOAD_REG_1/2. The transmitted data are ac-

tive as soon as the corresponding I2C telegram has

finished. Therefore, while changing parameters of the

demodulator section, a mute is recommended for the af-

fected channel (LOAD_SEQ_1/2: mute all FM,

LOAD_SEQ_1: switch audio processing to chan-

nel2/FM1 or mute channel1/FM2). Otherwise, distorted

sound may occur while switching.

For FM-stereo operation, the evaluation of the identifica-

tion signal must be performed. For positive identification

check, the MSP 3400C sound channels have to be

switched corresponding to the detected operation

mode.

6.4. Software Proposals for Multistandard TV-Sets

To familiarize the reader with the programming scheme

of the MSP 3400C, two examples in the shape of flow

diagrams are shown in the following sections.

6.4.1. Multistandard System B/G German DUAL FM

Fig. 6–1 shows a flow diagram for the CCU software,

applied for the MSP 3400C in a TV set, which facilitates

all standards according to System B/G. For the instruc-

tions used in the diagram, please refer to Table 6–12.

After having switched on the TV-set and having initial-

ized the MSP 3400C (LOAD_SEQ_1/2), FM-mono

sound is available.

Fig. 6–1 shows how to check for any stereo or bilingual

audio information in channel 1. If successful, the

MSP 3400C must be switched to the desired audio

mode.

Table 6–12: Sequences to initialize and start the MSP 3400C

LOAD_SEQ_1/2: General Initialization

1. AD_CV

2. FIR_REG_1

3. FIR_REG_2

4. MODE_REG

5. DCO1_LO

6. DCO1_HI

7. DCO2_LO

8. DCO2_HI

FM_IDENT_CHECK: Decoding of the identification signal

1. Evaluation of the stereo detection register (DFP register 0018hex, high part)

2. If necessary, switch the corresponding sound channels within the audio processing part

LOAD_SEQ_1: Reinitialization of Channel 1 without affecting Channel 2

1. FIR_REG_1

2. MODE_REG

3. DCO1_LO

4. DCO1_HI

(6 ⋅ 8 bit)

(12 bit)

(12 bit)

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