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| 型號： | TDA9950TT/C2,512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, SOT360-1, MO-153, TSSOP-20 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 112K |
| 代理商： | TDA9950TT/C2,512 |
TDA9950_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2007
11 of 24
NXP Semiconductors
TDA9950
CEC/I2C-bus translator
8.6 Example communication sequences
When writing, the rst 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 rst 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.
A = acknowledge (SDA = LOW)
S = START condition
P = STOP condition
Fig 4.
Host reads TDA9950 Status Register - after setting address pointer
A = acknowledge (SDA = LOW)
S = START condition
P = STOP condition
Fig 5.
Host reads TDA9950 Status Register - without setting address pointer (was at 0)
001aag925
SLAVE ADDRESS
from master to slave
SW
A
00000000
'0' (write)
SLAVE ADDRESS
R
A
P
A
Sr
<CSR>
Sr = repeated START condition
write address pointer
'1' (read)
read status
from slave to master
001aag926
SLAVE ADDRESS
SR
A
P
A
<CSR>
'1' (read)
read status
from master to slave
from slave to master
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