STMPE811_08 datasheet(12/54 Pages) STMICROELECTRONICS

Part #	STMPE811

Description	8-bit port expander with advanced touchscreen controller

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SPI interface

STMPE811

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5

SPI interface

The SPI interface in STMPE811 uses a 4-wire communication connection (DATA IN, DATA

OUT, CLK, CS). In the diagram, “Data in” is referred to as MOSI (master out slave in) and

“DATA out” is referred to as MISO (master in slave out).

5.1

SPI protocol definition

The SPI (serial peripheral interface) follows a byte sized transfer protocol. All transfers begin

with an assertion of CS_n signal (falling edge). The protocol for reading and writing is

different and the selection between a read and a write cycle is dependent on the first

captured bit on the slave device. A '1' denotes a read operation and a '0' denotes a write

operation. The SPI protocol defined in this section is shown in Figure 3.

The following are the main features supported by this SPI implementation.

●

Support of 1 MHz maximum clock frequency.

●

Support for autoincrement of address for both read and write.

●

Full duplex support for read operation.

●

Daisy chain configuration support for write operation.

●

Robust implementation that can filter glitches of up to 50 ns on the CS_n and SCL pins.

●

Support for all 4 modes of SPI as defined by the CPHA, CPOL bits on SPICON.

5.1.1

Register read

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

1.

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

2.

Drive a '1' on the first SCL launch clock on MOSI to select a read operation.

3.

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

4.

The next address byte can now be transmitted on the MOSI. If the autoincrement bit is

set, the following address transmitted on the MOSI is ignored. Internally, the address is

incremented. If the autoincrement bit is not set, then the following byte denotes the

address of the register to be read next.

5.

Read data is transmitted by the slave device on the MISO (MSB first), starting from the

launch clock following the last address bit on the MOSI.

6.

Full duplex read operation is achieved by transmitting the next address on MOSI while

the data from the previous address is available on MISO.

7.

To end the read operation, a dummy address of all 0's is sent on MOSI.

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