STMPE811 datasheet(16/66 Pages) STMICROELECTRONICS

No de pièce	STMPE811

Description	S-Touch® advanced resistive touchscreen controller with 8-bit GPIO expander

PDF	66 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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16 / 66 page

SPI interface

STMPE811

16/66

Doc ID 14489 Rev 5

5.1.2

The following steps need to be followed for register write through SPI.

Assert CS_n by driving a '0' on this pin.

Drive a '0' on the first SCL launch clock on MOSI to select a write operation.

The next 7 bits on MOSI denote the 7-bit register address (MSB first).

The next byte on the MOSI denotes data to be written.

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.

STMPE811 Fiches technique(PDF) 16 Page - STMicroelectronics