Communication Processor Module
16-434 MPC823e REFERENCE MANUAL MOTOROLA
SPI
COMMUNICATION
16
PROCESSOR MODULE
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
Figure 16-122. SPI Block Diagram
TRANSMIT_REG
RECEIVE_REG
SHIFT_REGISTER
COUNTER
PINS INTERFACE
SPI MODE REG
PERIPHERAL BUSIMB
SPI BRG
SPIMISO
SPIMOSI
SPICLK
IN_CLK
RXD
TXD
BRGCLK
SPISEL
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