STMPE24M31 datasheet(15/85 Pages) STMICROELECTRONICS

15 / 85 page

STMPE16M31, STMPE24M31

Read operations

Doc ID 16174 Rev 4

15/85

Read operations

Read operations for one or more bytes

A write is first performed to load the base 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 more 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 byte, the bus master must not acknowledge the last

output byte and follow by a Stop condition. The data fetched are from consecutive

addresses. After the last memory address, the Address Counter 'rolls-over' and the device

continue to output data from the memory address of 0x00.

Acknowledgement in read operation

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

acknowledgement during the 9th bit time. If the bus master does not drive the SDA to low

state (no acknowledgement by the master), then the slave device terminates and switches

back to its idle mode, waiting for the next command.

Obsolete

Product(s)

- Obsolete

Product(s)

STMPE24M31 Datasheet(PDF) 15 Page - STMicroelectronics