STMPE811QTR datasheet(11/54 Pages) STMICROELECTRONICS

Part #	STMPE811QTR

Description	8-bit port expander with advanced touchscreen controller

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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STMPE811

I2C interface

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4.3

Read operation

A write is first performed to load the register address into the Address Counter but without

sending a Stop condition. Then, the bus master sends a reStart condition and repeats the

Device Address with the R/W bit set to 1. The slave device acknowledges and outputs the

content of the addressed byte. If no additional data is to be read, the bus master must not

acknowledge the byte and terminates the transfer with a Stop condition.

If the bus master acknowledges the data byte, then it can continue to perform the data

reading. To terminate the stream of data bytes, the bus master must not acknowledge the

last output byte, and be followed by a Stop condition. If the address of the register written

into the Address Counter falls within the range of addresses that has the auto-increment

function, the data being read will be coming from consecutive addresses, which the internal

Address Counter automatically increments after each byte output. After the last memory

address, the Address Counter 'rolls-over' and the device continues to output data from the

memory address of 0x00. Similarly, for the register address that falls within a non-increment

range of addresses, the output data byte comes from the same address (which is the

address referred by the Address Counter).

Acknowledgement in read operation

For the above read command, the slave device waits, after each byte read, for an

acknowledgement during the ninth bit time. If the bus master does not drive the SDA to a

low state, then the slave device terminates and switches back to its idle mode, waiting for

the next command.

4.4

Write operations

A write is first performed to load the register address into the Address Counter without

sending a Stop condition. After the bus master receives an acknowledgement from the slave

device, it may start to send a data byte to the register (referred by the Address Counter).

The slave device again acknowledges and the bus master terminates the transfer with a

Stop condition.

If the bus master needs to write more data, it can continue the write operation without

issuing the Stop condition. Whether the Address Counter autoincrements or not after each

data byte write depends on the address of the register written into the Address Counter.

After the bus master writes the last data byte and the slave device acknowledges the receipt

of the last data, the bus master may terminate the write operation by sending a Stop

condition. When the Address Counter reaches the last memory address, it 'rolls-over' to the

next data byte write.

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