參數(shù)資料
型號： 935263704557
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO DEMODULATOR, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 40/71頁
文件大?。?/td> 304K
代理商： 935263704557
2000 Aug 04
45
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
7.4.1
DEVICE STATUS REGISTER (DSR)
Table 73 Device status register (subaddress 0)
Table 74 Description of the device status register bits
76543210
P2IN
P1IN
RSSF
AMSTAT
VDSP
IDDUA
IDSTE
PFR
BIT
SYMBOL
DESCRIPTION
7
P2IN
Input from Port 2: this bit reects the status of the general purpose port pin P2;
see Section 7.3.3. If bit P2IN = 1 the general purpose port pin P2 is at HIGH level.
If bit P2IN = 0 the general purpose port pin P2 is at LOW level.
6
P1IN
Input from Port 1: this bit reects the status of the general purpose port pin P1;
see Section 7.3.3. If bit P1IN = 1 then the general purpose port pin P1 is at HIGH level.
If bit P1IN = 0 the general purpose port pin P1 is at LOW level.
5
RSSF
Reserve sound switching ag: if bit RSSF = 1 it is a copy of bit C4 in the NICAM status
register (see Section 7.4.2). It indicates that the FM (or AM for standard L) sound
matches the digital transmission and auto-muting should be enabled. If bit RSSF = 0
auto-muting should be disabled, as analog and digital sound are different.
4
AMSTAT
Auto-mute status: if bit AMSTAT = 1 it indicates that the auto-muting function has
switched from NICAM to the program of the rst sound carrier (i.e. FM mono or AM in
NICAM L systems).
3
VDSP
Identication of NICAM sound: if bit VDSP = 1 it indicates that digital transmission is a
sound source. If bit VDSP = 0 it indicates that the transmission is either data or a
currently undened format.
2
IDDUA
Identication of FM dual sound; A2 systems: if bit IDDUA = 1 an FM dual-language
signal has been identied. When neither bit IDSTE = 1 nor bit IDDUA = 1 the received
signal is assumed to be FM mono (A2 systems only).
1
IDSTE
Identication of FM stereo; A2 systems: if bit IDSTE = 1 an FM stereo signal has been
identied (A2 systems only).
0
PFR
Power failure register: the power supply for the digital part of the device (VDDD1) has
temporarily been lower than the specied lower limit. If this is detected an initialization of
the device has to be carried out to ensure reliable operation.
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