MSP4458 datasheet(80/85 Pages) MICRONAS

80 / 85 page

MSP 44x8G

PRELIMINARY DATA SHEET

Micronas

6.6. Manual Mode:

Description of DSP Read Registers

All readable registers are 16-bit wide. Transmissions

via I2C bus have to take place in 16-bit words. Some of

the defined 16-bit words are divided into low and high

byte, thus holding two different control entities.

These registers are not writable.

6.6.1. Stereo Detection Register

for A2 Stereo Systems

Note: It is not necessary to read out and evaluate the

A2 identification level. All evaluation is performed in

the MSP and indicated in the STATUS register.

6.6.2. DC Level Register

The DC level register measures the DC component of

the incoming FM signals (FM1 and FM2). This can be

used for seek functions in satellite receivers and for IF

FM frequencies fine tuning. If the DCO frequency is

lower than the actuel carrier frequency, the resulting

DC level will be positive, an dvia versa. In the audio

signal the DC content is suppressed. The time con-

stant

τ, defining the transition time of the DC Level

6.7. Demodulator Source Channels in Manual Mode

6.7.1. Terrestrial Sound Standards

Table 6–11 shows the source channel assignment of

the demodulated signals in case of manual mode for

all terrestrial sound standards. See Table 2–2 for the

assignment in the Automatic Sound Select mode. In

manual mode for terrestrial sound standards, only two

demodulator sources are defined.

6.7.2. SAT Sound Standards

Table 6–12 shows the source channel assignment of

the demodulated signals for SAT sound standards.

Stereo Detection

00 18hex

Stereo Mode

Reading

(two’s complement)

MONO

near zero

STEREO

positive value (ideal

reception: 7Fhex)

BILINGUAL

negative value (ideal

reception: 80hex)

DC Level Readout

FM1 (MSP-Ch2)

00 1Bhex

DC Level Readout

FM2 (MSP-Ch1)

00 1Chex

DC Level

[8000hex ... 7FFFhex]

values are 16 bit two’s

complement

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