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TDA9950

CEC/I2C-bus translator

NXP Semiconductors. 

NXP Semiconductors

TDA9950

CEC/I2C-bus translator

8.6 Example communication sequences

When writing, the first byte after the slave address will contain the Address Pointer

Register value. Subsequent bytes are written to the register addressed by the Address

Pointer Register.

If the host wishes to write to two or more discontiguous registers, two separate write

sequences must be used with a STOP/START or repeated START condition between

them. Contiguous ranges of registers can be written in one communication sequence

between a START and STOP condition. Messages in the CEC Data Registers must be

written and read as contiguous ranges of registers.

When reading, values are read starting at the register currently addressed by the Address

Pointer Register. The pointer auto-increments after each read. If the host should read past

register 19h, or read more bytes than indicated by the FrameByteCount in register CDR[0]

(address 07h), the value FFh will be returned.

When the address pointer is 00h, it does not auto-increment. This allows repetitive polling

of the TDA9950 Status Register without the need to reset the Address Pointer Register.

If the address pointer needs to be set before a read takes place, the host must first write to

the Address Pointer Register and then, after a repeated start condition (or a STOP/START

sequence), commence reading as many data bytes as it requires.

S SLAVE ADDRESS W A 0000 0000 A Sr SLAVE ADDRESS

R A <CSR> A P

write address pointer

'0' (write)

Sr = repeated START condition

'1' (read) read status

from master to slave

from slave to master

001aag925

Fig 4.

A = acknowledge (SDA = LOW)

S = START condition

P = STOP condition

Host reads TDA9950 Status Register - after setting address pointer

S SLAVE ADDRESS

R A <CSR> A P

'1' (read) read status

from master to slave

from slave to master

001aag926

Fig 5.

A = acknowledge (SDA = LOW)

S = START condition

P = STOP condition

Host reads TDA9950 Status Register - without setting address pointer (was at 0)

TDA9950_2

Product data sheet

Rev. 02 — 22 October 2009

© NXP B.V. 2009. All rights reserved.

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