MOTOROLA

MPC555 Product Brief

5

Key Features

1.2.10 Two CAN 2.0B Controller Modules (TouCAN)

Each TouCAN provides these features:

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Full implementation of CAN protocol specification, version 2.0A and 2.0B

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Each module has 16 receive/transmit message buffers of 0 to 8 bytes data length

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Global mask register for message buffers 0 to 13

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Independent mask registers for message buffers 14 and 15

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Programmable transmit-first scheme: lowest ID or lowest buffer number

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16-bit free-running timer for message time-stamping

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Low power sleep mode with programmable wake-up on bus activity

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Programmable I/O modes

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Maskable interrupts

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Independent of the transmission medium (external transceiver is assumed)

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Open network architecture

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Multimaster concept

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High immunity to EMI

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Short latency time for high-priority messages

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Low power sleep mode with programmable wakeup on bus activity

1.2.11 Queued Serial Multi-Channel Module (QSMCM)

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Queued serial peripheral interface (QSPI)

— Provides full-duplex communication port for peripheral expansion or interprocessor

communication

— Up to 32 preprogrammed transfers, reducing overhead

— 160-byte queue buffer

— Programmable transfer length: from 8 to 16 bits, inclusive

— Synchronous interface with baud rate of up to system clock divided by 4

— Four programmable peripheral-select pins support up to 16 devices

— Wrap-around mode allows continuous sampling for efficient interfacing to serial peripherals

(e.g., – serial A/D converters, I/O latches, etc.)

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Two serial communications interfaces (SCI). Each SCI offers these features:

— UART mode provides NRZ format and half-or full-duplex interface

— 16 register receive buffer and 16 register transmit buffer (SCI1 only)

— Advanced error detection and optional parity generation and detection

— Word length programmable as 8 or 9 bits

— Separate transmitter and receiver enable bits and double buffering of data

— Wakeup functions allow the CPU to run uninterrupted until either a true idle line is detected or

a new address byte is received

— External source clock for baud generation

— Multiplexing of transmit data pins with discrete outputs and receive data pins with discrete

inputs, allowing realization of a low-speed serial protocol