tda9870ah NXP Semiconductors, tda9870ah Datasheet - Page 76
tda9870ah
Manufacturer Part Number
tda9870ah
Description
Digital Tv Sound Processor Dtvsp
Manufacturer
NXP Semiconductors
Datasheet
1.TDA9870AH.pdf
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Philips Semiconductors
10.4
As a slave transmitter, the TDA9870A provides 13 registers with status information and data, a part of which is for Philips
internal purposes only. These registers can be accessed by means of subaddresses.
Table 81 General format for reading data from the TDA9870A
Table 82 Explanation of Tables 81 and 83
Reading of data can start at any valid subaddress. It is allowed to read more than 1 data byte per transmission from the
TDA9870A. In this situation, the subaddress is automatically incremented after each data byte, which results in reading
the sequence of data bytes from successive register locations, starting at SUBADDRESS.
Table 83 Format of a transmission using automatic incrementing of subaddresses
Note
1. n data bytes with auto-increment of subaddresses.
Each data byte in a read sequence, except for the last one, is acknowledged with Am (acknowledge by the master).
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.
1999 Dec 20
S SLAVE ADDRESS 0 ACK SUBADDRESS ACK Sr
S
SLAVE ADDRESS
0
ACK
SUBADDRESS
Sr
1
DATA
NAm
Am
P
S SLAVE ADDRESS 0 ACK SUBADDRESS ACK Sr
Digital TV Sound Processor (DTVSP)
Slave transmitter mode
BIT
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
76
ADDRESS
SLAVE ADDRESS
SLAVE
FUNCTION
1 ACK
1
DATA BYTE
Am
ACK
(1)
Product specification
TDA9870A
DATA NAm P
DATA NAm P
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