MC68HC812A4 Datasheet, PDF (264/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Serial Peripheral Interface (SPI)
15.12 Synchronous Character Transmission using the SPI . . . . . . .282
15.12.1 Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .282
15.12.2 Code Listing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .282
15.2 Introduction
The serial peripheral interface (SPI) allows full-duplex, synchronous,
serial communications with peripheral devices.
15.3 Features
Features of the SPI include:
• Full-duplex operation
• Master mode and slave mode
• Programmable slave-select output option
• Programmable bidirectional data pin option
• Two flags with interrupt-generation capability:
– Transmission complete
– Mode fault
• Write collision detection
• Read data buffer
• Serial clock with programmable polarity and phase
• Reduced drive control for lower power consumption
• Programmable open-drain output option
MC68HC812A4 — Rev. 3.0
264
Serial Peripheral Interface (SPI)
Advance Information
MOTOROLA