MC68HC908GR4MP datasheet(298/408 Pages) FREESCALE

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Serial Peripheral Interface (SPI)

Technical Data

MC68HC908GR8 — Rev 4.0

298

Serial Peripheral Interface (SPI)

MOTOROLA

20.3 Features

Features of the SPI module include:

•

Full-duplex operation

•

Master and slave modes

•

Double-buffered operation with separate transmit and receive

registers

•

Four master mode frequencies (maximum = bus frequency

÷ 2)

•

Maximum slave mode frequency = bus frequency

•

Serial clock with programmable polarity and phase

•

Two separately enabled interrupts:

–

SPRF (SPI receiver full)

–

SPTE (SPI transmitter empty)

•

Mode fault error flag with CPU interrupt capability

•

Overflow error flag with CPU interrupt capability

•

Programmable wired-OR mode

•

I2C (inter-integrated circuit) compatibility

•

I/O (input/output) port bit(s) software configurable with pullup

device(s) if configured as input port bit(s)

20.4 Pin Name Conventions and I/O Register Addresses

The text that follows describes the SPI. The SPI I/O pin names are SS

(slave select), SPSCK (SPI serial clock), CGND (clock ground), MOSI

(master out slave in), and MISO (master in/slave out). The SPI shares

four I/O pins with four parallel I/O ports.

Freescale Semiconductor, Inc.

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