MPC5645S datasheet(18/146 Pages) FREESCALE

18 / 146 page

Qorivva MPC5645S Microcontroller Data Sheet, Rev. 8

Freescale Semiconductor

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Programmable data frames from 4 to 16 bits

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Up to 3 chip select lines available, depending on package and pin multiplexing, enable 8 external devices to be selected

using external muxing from a single DSPI

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Eight clock and transfer attributes registers

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Chip select strobe available as alternate function on one of the chip select pins for de-glitching

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FIFOs for buffering up to 4 transfers on the transmit and receive side

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General purpose I/O functionality on pins when not used for SPI

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Queueing operation possible through use of eDMA

1.4.23

FlexCAN

The MPC5645S includes up to three controller area network (FlexCAN) modules. The FlexCAN module is a communication

controller implementing the CAN protocol according to Bosch Specification version 2.0B. The CAN protocol was designed to

be used primarily as a vehicle serial data bus, meeting the specific requirements of this field: real-time processing, reliable

operation in the EMI environment of a vehicle, cost-effectiveness, and required bandwidth.

Each FlexCAN module offers the following:

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Compliant with CAN protocol specification, Version 2.0B active

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64 mailboxes, each configurable as transmit or receive

— Mailboxes configurable while module remains synchronized to CAN bus

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Transmit features

— Supports configuration of multiple mailboxes to form message queues of scalable depth

— Arbitration scheme according to message ID or message buffer number

— Internal arbitration to guarantee no inner or outer priority inversion

— Transmit abort procedure and notification

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Receive features

— Individual programmable filters for each mailbox

— 8 mailboxes configurable as a 6-entry receive FIFO

— 8 programmable acceptance filters for receive FIFO

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Programmable clock source

— System clock

— Direct oscillator clock to avoid PLL jitter

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Listen only mode capabilities

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CAN Sampler

— Can catch the 1st message sent on the CAN network while the MCU is stopped, which guarantees a clean startup

of the system without missing messages on the CAN network

— The CAN sampler is connected to one of the CAN RX pins

1.4.24

Serial communication interface module (LINFlex)

The MPC5645S devices include up to four LINFlex modules and support for LIN Master mode, LIN Slave mode, and UART

mode. The modules are LIN state machine compliant to the LIN 1.3, 2.0, and 2.1 Specifications and handle LIN frame

transmission and reception without CPU intervention.

Other features include:

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Autonomous LIN frame handling

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Message buffer to store identifier and up to eight data bytes

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Supports message length of up to 64 bytes

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