Motorola MPC823e Reference Manual page 888

Communication Processor Module
IMB
SPI MODE REG
COUNTER
SPISEL
16.12.1 Features
The following is a list of the serial peripheral interface's main features:
• Four-Wire Interface (SPIMOSI, SPIMISO, SPICLK, and SPISEL)
• Full-Duplex Operation
• Works with Data Characters from 4 to 16 Bits Long
• Supports Back-to-Back Character Transmission and Reception
• Master or Slave SPI Modes Supported
• Multimaster Environment Support
• Continuous Transfer Mode for Autoscanning Peripherals
• Supports Maximum Clock Rates of 6.25MHz in Master Mode and 12.5MHz in Slave
Mode, Assuming a 25MHz System Clock is Used
• Independent Programmable Baud Rate Generator
• Programmable Clock Phase and Polarity
• Open-Drain Output Pins Support Multimaster Configuration
• Local Loopback Capability for Testing
16-434
PERIPHERAL BUS
TRANSMIT_REG
SHIFT_REGISTER
RXD
IN_CLK
PINS INTERFACE
SPIMOSI
SPIMISO SPICLK
Figure 16-122. SPI Block Diagram
MPC823e REFERENCE MANUAL
RECEIVE_REG
TXD
SPI BRG
BRGCLK
MOTOROLA