mpc5645s Freescale Semiconductor, Inc, mpc5645s Datasheet - Page 18

• Manufacturer Part Number: mpc5645s
• Description: Mpc5645s Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

Overview
1.3.23
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:
1.3.24
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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Programmable data frames from 4 to 16 bits
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
Eight clock and transfer attributes registers
Chip select strobe available as alternate function on one of the chip select pins for de-glitching
FIFOs for buffering up to 4 transfers on the transmit and receive side
General purpose I/O functionality on pins when not used for SPI
Queueing operation possible through use of eDMA
Compliant with CAN protocol specification, Version 2.0B active
64 mailboxes, each configurable as transmit or receive
— Mailboxes configurable while module remains synchronized to CAN bus
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
Receive features
— Individual programmable filters for each mailbox
— 8 mailboxes configurable as a 6-entry receive FIFO
— 8 programmable acceptance filters for receive FIFO
Programmable clock source
— System clock
— Direct oscillator clock to avoid PLL jitter
Listen only mode capabilities
CAN Sampler
— Can catch the 1st message sent on the CAN network while the MCU is stopped, which guarantees a clean startup
— The CAN sampler is connected to one of the CAN RX pins
Autonomous LIN frame handling
Message buffer to store identifier and up to eight data bytes
Supports message length of up to 64 bytes
of the system without missing messages on the CAN network
FlexCAN
Serial communication interface module (LINFlex)
MPC5645S Microcontroller Data Sheet, Rev. 6
Freescale Semiconductor