STV9432 Ver la hoja de datos (PDF) - STMicroelectronics

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STV9432

100MHz OSD FOR MONITOR

STMicroelectronics 

STV9432

6 - SERIAL INTERFACE

The 2-wires serial interface is an I2C interface. To be

connected to the I2C bus, a device must own its slave

address; the slave address of the STV9432 is BA (in

hexadecimal).

A6 A5 A4 A3 A2 A1 A0 RW

1011101

6.1 - DATA TRANSFER IN WRITE MODE

The host MCU can write data into the STV9432 regis-

ters or RAM.

To write data into the STVA9432TA after a start, the

MCU must send (Figure 2):

- First, the I2C address slave byte with a low level for

the R/W bit,

Figure 2. I2C Write Operation

- The two bytes of the internal address where the

MCU wants to write data(s),

- The successive bytes of data(s).

All bytes are sent MSB bit first and the write data

transfer is ended with a stop.

6.2 - DATA TRANSFER IN READ MODE

The host MCU can read data from the STV9432 reg-

isters, RAM or ROM.

To read data from the STV9432 (Figure 3), the MCU

must send 2 different I2C sequences. The first one

includes the I2C slave address byte with R/W bit at

low level and the 2 internal address bytes.

The second one includes the I2C slave address byte

with R/W bit at high level and all the successive data

bytes read at successive addresses starting from the

initial address given by the first sequence.

SCL

SDA

Start

I2C Slave Address

R/W

A7 A6 A5 A4 A3 A2 A1 A0

-

ACK

LSB Address

ACK

- A13 A12 A11 A10 A9 A8

MSB Address

ACK

SCL

SDA

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

Data Byte 1

ACK

Data Byte 2

ACK

D7 D6 D5 D4 D3 D2 D1 D0

Data Byte n

ACK

Stop

Figure 3. I2C Read Operation

SCL

SDA

Start

I2C Slave Address

SCL

SDA

Start

I2C Slave Address

R/W

A7 A6 A5 A4 A3 A2 A1 A0

-

ACK

LSB Address

ACK

- A13 A12 A10 A10 A9 A8

MSB Address

ACK

Stop

R/W

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0

ACK*

Data Byte 1

ACK

Data Byte n

ACK

Stop

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