ST90R158 datasheet(131/190 Pages) STMICROELECTRONICS

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ST90158 - SERIAL PERIPHERAL INTERFACE (SPI)

9.4 SERIAL PERIPHERAL INTERFACE (SPI)

9.4.1 Introduction

The Serial Peripheral Interface (SPI) is a general

purpose on-chip shift register peripheral. It allows

communication with external peripherals via an

SPI protocol bus.

In addition, special operating modes allow re-

duced software overhead when implementing I2C-

bus and IM-bus communication standards.

The SPI uses up to 3 pins: Serial Data In (SDI),

Serial Data Out (SDO) and Synchronous Serial

Clock (SCK). Additional I/O pins may act as device

selects or IM-bus address identifier signals.

The main features are:

Full duplex synchronous transfer if 3 I/O pins are

used

Master operation only

4 Programmable bit rates

Programmable clock polarity and phase

Busy Flag

End of transmission interrupt

Additional hardware to facilitate more complex

protocols

9.4.2 Device-Specific Options

Depending on the ST9 variant and package type,

the SPI interface signals may not be connected to

separate external pins. Refer to the Peripheral

Configuration Chapter for the device pin-out.

Figure 64. Block Diagram

READ BUFFER

SERIAL PERIPHERAL INTERFACE DATA REGISTER

( SPIDR )

POLARITY

PHASE

BAUD RATE

MULTIPLEXER

ST9 INTERRUPT

TRANSMISSION

END OF

SPEN BMS

ARB BUSY CPOL CPHA SPR1 SPR0

DATA BUS

R254

INTCLK

SERIAL PERIPHERAL CONTROL REGISTER ( SPICR )

R253

SDO

SDI SCK/INT2

VR000347

INT2

INTERNAL

SERIAL

CLOCK

TO MSPI

CONTROL

LOGIC

INTB0

* Common for Transmit and Receive

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