MSP 3400C
PRELIMINARY DATA SHEET
6.3. Sequences to Transmit Parameters and to Start
Processing
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.
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-
6.4.1. Multistandard System B/G German DUAL FM
2
tive as soon as the corresponding I C telegram has
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.
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.
After having switched on the TV-set and having initial-
ized the MSP 3400C (LOAD_SEQ_1/2), FM-mono
sound is available.
ForFM-stereooperation, theevaluationoftheidentifica-
tion signal must be performed. For positive identification
check, the MSP 3400C sound channels have to be
switched corresponding to the detected operation
mode.
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 0018 , high part)
hex
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)
MICRONAS INTERMETALL
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MICRONAS [ MICRONAS ]
