MC68HC908AP16CFB datasheet(291/440 Pages) MOTOROLA

291 / 440 page

Serial Peripheral Interface Module (SPI)

Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

291

15.4 Functional Description

Figure 15-2 shows the structure of the SPI module.

Figure 15-2. SPI Module Block Diagram

The SPI module allows full-duplex, synchronous, serial communication

between the MCU and peripheral devices, including other MCUs.

Software can poll the SPI status flags or SPI operation can be interrupt-

driven.

The following paragraphs describe the operation of the SPI module.

TRANSMITTER CPU INTERRUPT REQUEST

RESERVED

RECEIVER/ERROR CPU INTERRUPT REQUEST

76543210

SPR1

SPMSTR

TRANSMIT DATA REGISTER

SHIFT REGISTER

SPR0

CGMOUT

÷ 2

CLOCK

SELECT

÷ 2

CLOCK

DIVIDER

÷ 8

÷ 32

÷ 128

CLOCK

LOGIC

CPHA

CPOL

SPI

SPRIE

SPE

SPWOM

SPRF

SPTE

OVRF

RESERVED

CONTROL

LOGIC

RECEIVE DATA REGISTER

SPTIE

SPE

INTERNAL BUS

FROM SIM

MODFEN

ERRIE

CONTROL

MODF

SPMSTR

MOSI

MISO

SPSCK

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 291 Page - Motorola, Inc

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