stmpe16m31 STMicroelectronics, stmpe16m31 Datasheet - Page 15

• Manufacturer Part Number: stmpe16m31
• Description: S-touch? 16/24-channel Touchkey Controller With Pwm And Ratio Engines
• Manufacturer: STMicroelectronics

STMPE16M31, STMPE24M31
3
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.
Doc ID 16174 Rev 3
Read operations
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