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參數(shù)資料
| 型號(hào)： | TDA9875AH/V2,557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | PLASTIC, QFP |
| 文件頁數(shù)： | 26/96頁 |
| 文件大?。?/td> | 324K |
| 代理商： | TDA9875AH/V2,557 |
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1999 Dec 20
32
Philips Semiconductors
Product specication
Digital TV Sound Processor (DTVSP)
TDA9875A
10.3
Slave receiver mode
As a slave receiver, the TDA9875A provides 46 registers for storing commands and data. These registers are accessed
via so-called subaddresses. A subaddress can be thought of as a pointer to an internal memory location.
Table 10 I2C-bus; slave address, subaddress and data format
Table 11 Explanation of Table 10
It is allowed to send more than one data byte per transmission to the TDA9875A. In this event, the subaddress is
automatically incremented after each data byte, resulting in storing the sequence of data bytes at successive register
locations, starting at SUBADDRESS. A transmission can start at any valid subaddress. Each byte is acknowledged with
ACK (acknowledge).
There is no ‘wrap-around’ of subaddresses.
Commands and data are processed as soon as they have been completely received. Functions requiring more than one
byte will, thus, be executed only after all bytes for that function have been received. If the transmission is terminated
(STOP condition) before all bytes have been received, the incomplete data for that function are ignored.
Table 12 Format for a transmission employing auto-increment of subaddresses
Note
1. n data bytes with auto-increment of subaddresses.
Data patterns sent to the various subaddresses are not checked for being illegal or not at that address, except for the
functions of volume, bass, treble control, bass boost and level adjust.
Detection of a STOP condition without a preceding acknowledge bit is regarded as a bus error. The last operation will
then not be executed.
S
SLAVE ADDRESS
0
ACK
SUBADDRESS
ACK
DATA
ACK
P
BIT
FUNCTION
S
START condition
SLAVE ADDRESS
7-bit device address
0
data direction bit (write to device)
ACK
acknowledge by slave
SUBADDRESS
address of register to write to
DATA
data byte to be written into register
P
STOP condition
S
SLAVE ADDRESS
0
ACK
SUBADDRESS
ACK
DATA
BYTE A(1)
DATA
ACK
P
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