MSP 34x1G
PRELIMINARY DATA SHEET
3.3.2.1. STANDARD SELECT Register
3.3.2.2. Refresh of STANDARD SELECT Register
The TV sound standard of the MSP 34x1G demodula-
tor is determined by the STANDARD SELECT register.
There are two ways to use the STANDARD SELECT
register:
A general refresh of the STANDARD SELECT register
is not allowed. However, the following method
enables watching the MSP 34x1G “alive” status and
detection of accidental resets (only versions A2 and
later):
– Setting up the demodulator for a TV sound standard
by sending the corresponding standard code with a
single I2C-Bus transmission.
– After Power-on, bit[15] of CONTROL will be set; it
must be read once to enable the reset-detection
feature.
– Starting the Automatic Standard Detection for ter-
restrial TV standards. This is the most comfortable
way to set up the demodulator. Within 0.5 s, the
detection and set-up of the actual TV sound stan-
dard is performed. The detected standard can be
read out of the STANDARD RESULT register by the
control processor. This feature is recommended for
the primary set-up of a TV set. Outputs should be
muted during Automatic Standard Detection.
– Reading of the CONTROL register and checking
the reset indicator bit[15] .
– If bit[15] is “0”, any refresh of the STANDARD
SELECT register is not allowed.
– If bit[15] is “1”, indicating a reset, a refresh of the
STANDARD SELECT register and all other MSPG
registers is necessary.
The Standard Codes are listed in Table 3–7.
Selecting a TV sound standard via the STANDARD
SELECT register initializes the demodulator. This
includes: AGC, tuning frequency, band-pass filters,
demodulation mode (FM, AM, or NICAM), carrier
mute, deemphasis, and identification mode.
If a present sound standard is impossible for a specific
MSP version, it switches to the analog mono sound of
this standard. In that case stereo or bilingual process-
ing will not be possible.
For a complete setup of the TV sound processing from
analog IF input to the source selection, the transmis-
sions as shown in Section 3.5. are necessary.
Note: The FM matrix is set automatically if Automatic
Sound Select is active (MODUS[0]=1). In this case, the
FM matrix will be initialized with “Sound A Mono”. Dur-
ing operation, the FM matrix will be automatically
selected according to the actual identification informa-
tion.
For reasons of software compatibility to the
MSP 34x0D, a Manual/Compatibility mode is avail-
able. A detailed description of this mode can be found
on page 83.
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MICRONAS INTERMETALL
MICRONAS [ MICRONAS ]
