MC68HC11P2 Datasheet, PDF (125/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Technical Data — MC68HC11P2
Section 7. Serial Peripheral Interface (SPI)
7.1 Contents
7.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
7.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
7.4 SPI transfer formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
7.5 SPI signals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
7.6 SPI system errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
7.7 SPI registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
7.2 Introduction
The serial peripheral interface (SPI), an independent serial
communications subsystem, allows the MCU to communicate
synchronously with peripheral devices, such as transistor-transistor
logic (TTL) shift registers, liquid crystal (LCD) display drivers, analog-to-
digital converter subsystems, and other microprocessors. The SPI is
also capable of inter-processor communication in a multiple master
system. The SPI system can be configured as either a master or a slave
device, with data rates as high as one half of the E clock rate when
configured as a master and as fast as the E clock rate when configured
as a slave.
The SPI shares I/O with four of port D’s pins and is enabled by SPE in
the SPCR:
MC68HC11P2 — Rev 1.0
Serial Peripheral Interface (SPI)
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Technical Data