EM77950 datasheet(76/102 Pages) EMC

76 / 102 page

EM77950

BB Controller

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Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

Direction Serial Peripheral Interface (SPI)

9.1 Introduction

The EM77950 communicates with other devices via SPI (Direction Serial Peripheral

Interface) module, as shown in Fig. 9-1. To accomplish communication, SPI uses three

wire synchronous protocols: Serial Clock, Serial Data Output, and Serial Data. If the

EM77950 is a master controller, it sends clock through the SCK pin. An 8-bit data is

transmitted and received at the same time. If the EM77950, however, is defined as a

slave, its SCK pin could be programmed as an input pin. Data will continue to be

shifted on the basis of both the clock rate and the selected edge.

9.2 Features

3-wire, full duplex synchronous transceiver

Operation in either Master mode or Slave mode

Programmable baud rates of communication

Programming clock polarity

Programmable data transmission order

Interrupt flag available for read buffer full

Up to 8 MHz (maximum) bit frequency

9.3 Block Diagram

Read Buffer

(SPIRB)

Write Buffer

(SPIWB)

Shift Register (SPIS)

Clock

Generator

Read Buffer

(SPIRB)

Write Buffer

(SPIWB)

Shift Register (SPIS)

Clock

Generator

SPI Master

SPI Slave

SDO

SCK

SDI

Fig. 9-1 Typical SPI Transceiver Mode

EM77950 Datasheet(PDF) 76 Page - ELAN Microelectronics Corp

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