RM0046 Introduction
Doc ID 16912 Rev 5 61/936
The FlexCAN module provides the following features:
● Full implementation of the CAN protocol specification, version 2.0B
– Standard data and remote frames
– Extended data and remote frames
– Up to 8-bytes data length
– Programmable bit rate up to 1 Mbit/s
● 32 message buffers of up to 8-bytes data length
● Each message buffer configurable as Rx or Tx, all supporting standard and extended
messages
● Programmable loop-back mode supporting self-test operation
● 3 programmable mask registers
● Programmable transmit-first scheme: lowest ID or lowest buffer number
● Time stamp based on 16-bit free-running timer
● Global network time, synchronized by a specific message
● Maskable interrupts
● Independent of the transmission medium (an external transceiver is assumed)
● High immunity to EMI
● Short latency time due to an arbitration scheme for high-priority messages
● 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
1.6.21 Safety port (FlexCAN)
The SPC560P40/34 MCU has a second CAN controller synthesized to run at high bit rates
to be used as a safety port. The CAN module of the safety port provides the following
features:
● Identical to the FlexCAN module
● Bit rate up to 8 Mbit/s at 64 MHz CPU clock using direct connection between CAN
modules (no physical transceiver required)
● 32 message buffers of up to 8-bytes data length
● Can be used as a second independent CAN module
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