參數(shù)資料
型號(hào): TDA9874AH
廠商: NXP SEMICONDUCTORS
元件分類: 接收器
英文描述: Digital TV sound demodulator/decoder
中文描述: AM/FM, AUDIO DEMODULATOR, PQFP44
封裝: 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44
文件頁(yè)數(shù): 51/68頁(yè)
文件大?。?/td> 231K
代理商: TDA9874AH
1999 Dec 03
51
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
10.4
Slave transmitter mode
As a slave transmitter, the TDA9874A provides 12 registers with status information and data, a part of which is for Philips
internal purposes only. Each register is accessed by means of a subaddress.
Detailed descriptions of the slave transmitter registers are given in Sections 10.4.1 to 10.4.9.
Reading of data can start at any valid subaddress. It is allowed to read more than 1 data byte per transmission from the
TDA9874A. In this case, the subaddress is automatically incremented after each data byte, resulting in reading the
sequence of data bytes from successive register locations, starting at SUBADDRESS.
Each data byte in a read sequence, except for the last one, is acknowledged with Am. The subaddresses ‘wrap around’
from decimal 255 to 0. If an attempt is made to read from a non-existing subaddress, the device will send a data pattern
of all ones, i.e. FF in hexadecimal notation.
Table 71
General format for reading data from the TDA9874A
Table 72
Explanation of Tables 71 and 73
Table 73
Format of a transmission using automatic incrementing of subaddresses
S SLAVE ADDRESS 0 A SUBADDRESS A Sr SLAVE ADDRESS 1 A
DATA
NAm P
BIT
FUNCTION
S
SLAVE ADDRESS
0
A
SUBADDRESS
Sr
1
DATA
NAm
Am
P
START condition
7-bit device address
data direction bit (write to device)
acknowledge (by the slave)
address of register to read from
repeated START condition
data direction bit (read from device)
data byte read from register
not acknowledge (by the master)
acknowledge (by the master)
STOP condition
S SLAVE ADDRESS 0 A SUBADDRESS A Sr SLAVE ADDRESS 1 A
DATA BYTE Am
n data bytes with
auto-increment
of subaddresses
DATA
NAm P
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