MSP 44x8G
PRELIMINARY DATA SHEET
6.6. Manual Mode:
6.7. Demodulator Source Channels in Manual Mode
6.7.1. Terrestrial Sound Standards
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.
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.
These registers are not writable.
6.6.1. Stereo Detection Register
for A2 Stereo Systems
6.7.2. SAT Sound Standards
Table 6–12 shows the source channel assignment of
the demodulated signals for SAT sound standards.
Stereo Detection
Register
00 18hex
H
Stereo Mode
Reading
(two’s complement)
MONO
near zero
STEREO
positive value (ideal
reception: 7Fhex
)
BILINGUAL
negative value (ideal
reception: 80hex)
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
DC Level Readout
FM1 (MSP-Ch2)
00 1Bhex
00 1Chex
H+L
H+L
DC Level Readout
FM2 (MSP-Ch1)
DC Level
[8000hex ... 7FFFhex]
values are 16 bit two’s
complement
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
Register, is approximately 28 ms.
80
Micronas
MICRONAS [ MICRONAS ]
