The Controller Area Network (CAN) is a serial communications protocol that efficiently supports distributed real-time control with a high level of reliability. CAN has high immunity to electrical interference and the ability to detect various type of errors. In CAN, many short messages are broadcast to the entire network, which provides data consistency in every node of the system.

The MCAN module supports both classic CAN and CAN FD (CAN with flexible data-rate) protocols. The CAN FD feature allows higher throughput and increased payload per data frame. Classic CAN and CAN FD devices may coexist on the same network without any conflict provided that partial network transceivers, which can detect and ignore CAN FD without generating bus errors, are used by the classic CAN devices. The MCAN module is compliant to ISO 11898-1:2015.

Figure 6-84 MCAN Module Overview

The MCAN module implements the following features:

• Conforms with CAN Protocol 2.0 A, B and ISO 11898-1:2015
• Full CAN FD support (up to 64 data bytes)
• AUTOSAR and SAE J1939 support
• Flexible Message RAM allocation (maximum configuration below is for a device with 4352 32-bit word message RAM)
  • Up to 32 dedicated transmit buffers
  • Configurable transmit FIFO, up to 32 elements
  • Configurable transmit queue, up to 32 elements
  • Configurable transmit Event FIFO, up to 32 elements
  • Up to 64 dedicated receive buffers
  • Two configurable receive FIFOs, up to 64 elements each
  • Up to 128 filter elements
• Loop-back mode for self-test
• Maskable interrupt (two configurable interrupt lines, correctable ECC, counter overflow and clock stop/wakeup)
• Non-maskable interrupt (uncorrectable ECC)
• Two clock domains (CAN clock/host clock)
• ECC check for Message RAM
• Clock stop and wake-up support
• Timestamp counter

Non-supported features:

• Host bus firewall
• Clock calibration
• Debug over CAN