ST72344S2 datasheet(116/247 Pages) STMICROELECTRONICS

116 / 247 page

On-chip peripherals

ST72344xx, ST2345xx

116/247

Doc ID 12321 Rev 6

Figure 56.

Serial peripheral interface block diagram

Functional description

A basic example of interconnections between a single master and a single slave is

illustrated in Figure 57.

The MOSI pins are connected together and the MISO pins are connected together. In this

way data is transferred serially between master and slave (most significant bit first).

The communication is always initiated by the master. When the master device transmits

data to a slave device via MOSI pin, the slave device responds by sending data to the

master device via the MISO pin. This implies full duplex communication with both data out

and data in, synchronized with the same clock signal (which is provided by the master

device via the SCK pin).

To use a single data line, the MISO and MOSI pins must be connected at each node (in this

case only simplex communication is possible).

Four possible data/clock timing relationships may be chosen (see Figure 60) but master and

slave must be programmed with the same timing mode.

SPIDR

Read Buffer

8-bit Shift Register

Write

Read

Data/Address Bus

SPI

SPIE

SPE

MSTR

CPHA

SPR0

SPR1

CPOL

SERIAL CLOCK

GENERATOR

MOSI

MISO

SCK

CONTROL

STATE

SPICR

SPICSR

Interrupt

request

MASTER

CONTROL

SPR2

SPIF WCOL

MODF

OVR

SSI

SSM

SOD

bit

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