MSP3410D datasheet(21/83 Pages) MICRONAS

21 / 83 page

PRELIMINARY DATA SHEET

MSP 34x0D

Micronas

6. Programming the Demodulator

and NICAM Decoder Section

6.1. Short-Programming and General

Programming of the Demodulator Part

The demodulator part of the MSP 34x0D can be pro-

grammed in two different modes:

1. Demodulator Short-Programming provides a com-

fortable way to set up the demodulator for many terres-

trial TV sound standards with one single I2C bus trans-

mission. The coding is listed in section 6.4.1. If a

parameter does not coincide with the individual pro-

gramming concept, it simply can be overwritten by

using the General Programming Mode. Some bits of

the registers AD_CV (see section 6.5.1. on page 25)

and MODE_REG (see section 6.5.2. on page 27) are

not affected by the short-programming. They must be

transmitted once if their reset status does not fit. The

Demodulator Short-Programming is not compatible to

MSP 3410B and MSP 3400C.

Autodetection for terrestrial TV standards is part of

the Demodulator Short-Programming. This feature

enables the detection and set-up of the actual TV

sound standard within 0.5 s. Since the detected stan-

dard is readable by the control processor, the Autode-

tection feature is mainly recommended for the primary

set-up of a TV set: after having once determined the

corresponding TV channels, their sound standards can

be stored and later on programmed by the Demodula-

tor Short-Programming (see section 6.4.1. on page 23

and section 6.6.1. on page 32).

2. General Programming ensures the software-com-

patibility to other MSPs. It offers a very flexible way to

apply all of the MSP 34x0D demodulator facilities. All

registers except 0020hex (Demodulator Short-Pro-

gramming) have to be written with values correspond-

ing to the individual requirements. For satellite applica-

tions, with their many variations, this mode must be

selected.

All transmissions on the control bus are 16 bits wide.

However, data for the demodulator part have only 8 or

12 significant bits. These data have to be inserted

LSB-bound and filled with zero bits into the 16-bit

transmission word. Table 4–1 explains how to assign

FM carriers to the MSP Sound IF channels and the

corresponding matrix modes in the audio processing

part.

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