HCS08 datasheet(192/290 Pages) MOTOROLA

192 / 290 page

Serial Peripheral Interface (SPI) Module

MC9S08GB/GT

192

MOTOROLA

12.1 Features

Features of the SPI module include:

•

Master or slave mode operation

•

Full-duplex or single-wire bidirectional option

•

Programmable transmit bit rate

•

Double-buffered transmit and receive

•

Serial clock phase and polarity options

•

Slave select output

•

Selectable MSB-first or LSB-first shifting

12.2 Block Diagrams

This section includes block diagrams showing SPI system connections, the internal organization of the SPI

module, and the SPI clock dividers that control the master mode bit rate.

12.2.1 SPI System Block Diagram

Figure 12-2 shows the SPI modules of two MCUs connected in a master-slave arrangement. The master

device initiates all SPI data transfers. During a transfer, the master shifts data out (on the MOSI pin) to the

slave while simultaneously shifting data in (on the MISO pin) from the slave. The transfer effectively

exchanges the data that was in the SPI shift registers of the two SPI systems. The SPSCK signal is a clock

output from the master and an input to the slave. The slave device must be selected by a low level on the

slave select input (SS pin). In this system, the master device has configured its SS pin as an optional slave

select output.

Figure 12-2 SPI System Connections

SPI SHIFTER

CLOCK

GENERATOR

SPI SHIFTER

SPSCK

MISO

MOSI

SPSCK

MISO

MOSI

MASTER

SLAVE

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