tda9950 NXP Semiconductors, tda9950 Datasheet - Page 6

• Manufacturer Part Number: tda9950
• Description: Tda9950 Cec/i?c-bus Translator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA9950_1
Product data sheet
8.3 Use of the INT line
8.4 Register descriptions
Registers 01h to 06h are used for configuration of the TDA9950, whilst repeated
auto-incremented reads starting at register 07h are used to transfer CEC data. Setting the
address pointer register higher than 07h is treated as setting it to 07h, as all message
data transfers must start from register 07h and continue by auto-incrementing in one
contiguous transfer. Transfers via the data registers are formatted using the data register
protocol described in
As the TDA9950 is an I
the host that data is available for reading. This is the INT output line, which should be
monitored by the host. An additional TDA9950 input, on pin
of the polarity of operation of the INT line. When the INT line is active, it will match the
state of the input on pin
The state of the INT line is always reflected in the TDA9950 Status Register, so it is
possible to regularly poll this register instead of monitoring the INT line. However, this
method is less efficient and not recommended. The INT indication in the TDA9950 Status
Register is not affected by the setting of the INT polarity input on pin
Table 6.
Table 7.
Bit
7 to 5
4 to 0
Bit
7
6
5
4 to 0
Symbol
reserved
REG_PTR[4:0]
Symbol
BUSY
INT
ERR
-
APR - Address Pointer Register (address 00h) bit description (Write mode)
CSR - TDA9950 Status Register (address 00h) bit description (Read mode)
Rev. 01 — 16 November 2007
Section
2
C-bus slave device, it provides an additional I/O line to signal to
INT_POL
8.5.
.
Description
reserved (must be set to 000)
Address Pointer: Address of the register that will be
read/written during further I
Description
BUSY:
0 = the TDA9950 is able to handle requests.
1 = the TDA9950 is busy and cannot accept any further
request.
INT:
0 = the INT interrupt output is inactive.
1 = the INT interrupt output is active.
ERR:
0 = no error.
1 = an error occurred (specified in the TDA9950 Error
Register). Cleared by a read of the TDA9950 Error Register.
not used
2
C-bus communication.
INT_POL
CEC/I
, allows configuration
INT_POL
TDA9950
© NXP B.V. 2007. All rights reserved.
2
C-bus translator
.
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