S912XHY128F0VLM Datasheet, PDF (493/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Chapter 15
Serial Peripheral Interface (S12SPIV5)
15.1 Introduction
The SPI module allows a duplex, synchronous, serial communication between the MCU and peripheral
devices. Software can poll the SPI status flags or the SPI operation can be interrupt driven.
15.1.1
Glossary of Terms
SPI
SS
SCK
MOSI
MISO
MOMI
SISO
Serial Peripheral Interface
Slave Select
Serial Clock
Master Output, Slave Input
Master Input, Slave Output
Master Output, Master Input
Slave Input, Slave Output
15.1.2 Features
The SPI includes these distinctive features:
• Master mode and slave mode
• Selectable 8 or 16-bit transfer width
• Bidirectional mode
• Slave select output
• Mode fault error flag with CPU interrupt capability
• Double-buffered data register
• Serial clock with programmable polarity and phase
• Control of SPI operation during wait mode
15.1.3 Modes of Operation
The SPI functions in three modes: run, wait, and stop.
• Run mode
This is the basic mode of operation.
• Wait mode
MC9S12XHY-Family Reference Manual, Rev. 1.01
Freescale Semiconductor
493