Specifications

The Pace-Setting Performance and Features of the 56F8300 Hybrid Controllers
MOTOROLA Motorola 56F8300 Hybrid Controller Family 29
Figure 1-18 shows two examples of the SCI used as a multiprocessor communication network.
Figure 1-18. SCI: Multiprocessor Communication
3.2.11 Serial Peripheral Interface (SPI)
This synchronous serial interface is double buffered and operates in wide variety of modes, rates, and
bit lengths, enabling the glueless connection to external peripherals and other processors at rates up to
30 Mbps. Some potential applications are in LCD drivers, A/D subsystems, and MCU systems. Here
are some of the features and benefits of the SPI module:
• Supports interprocessor communications in a multiple master system
• Supports demand-driven master or slave devices with high data rates
• Full-duplex operation
• Double-buffered operation with separate transmit and receive registers
• Programmable length transmissions from 2 to 16 bits
• Programmable transmit and receive shift order, MSB or last bit transmitted
• Four master mode frequencies (maximum = bus frequency / 2)
• Maximum slave mode frequency = bus frequency
• Serial clock with programmable polarity and phase
• Two separately enabled interrupts:
— Receiver Full
— Transmitter Empty
• Mode fault and overflow error flag with device interrupt capability
Full Duplex Operation Half Duplex Operation
56F8323
RXD TXD
56F8323
RXD TXD
RXD TXDRXD TXD RXD TXDRXD TXD
56F826
MC
68HC908
8051
MCU
Master
Processor
Slave Processors
56F8323
TXD/RXD
56F8323
TXD/RXD
TXD/RXDTXD/RXD RXD TXDRXD TXD
56F827
MC
68HC908
Master
Processor
Slave Processors
In full duplex operation, asynchronous transmitter and
reception can occur simultaneously. The master
processor manages the communication flow.
In half duplex operation, asynchronous data
transmission can be transmitted in both directions via a
single wire, but not at the same time. The master
processor manages the communication flow.
8051
MCU
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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