Datasheet

SPI interface STMPE811
16/65 Doc ID 14489 Rev 6
5.1.2 Register write
The following steps need to be followed for register write through SPI.
1. Assert CS_n by driving a '0' on this pin.
2. Drive a '0' on the first SCL launch clock on MOSI to select a write operation.
3. The next 7 bits on MOSI denote the 7-bit register address (MSB first).
4. The next byte on the MOSI denotes data to be written.
5. The following transmissions on MOSI are considered byte-sized data. The register
address to which the following data is written depends on whether the autoincrement
bit in the SPICON register is set. If this bit has been set previously, the register address
is incremented for data writes.
5.1.3 Termination of data transfer
A transfer can be terminated before the last launch edge by deasserting the CS_n signal. If
the last launch clock is detected, it is assumed that the data transfer is successful.