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CHAPTER 21 CAN CONTROLLER
21.4 Classifying CAN Controller Registers
There are 3 types of CAN controller registers;
• Overall control registers
• Message buffer control registers
• Message buffers
■ Overall Control Registers
The overall control registers are the following 4 registers;
• Control status register (CSR)
• Last event indicator register (LEIR)
• Receive and transmit error counter (RTEC)
• Bit timing register (BTR)
■ Message Buffer Control Registers
The message buffer control registers are the following 14 registers;
• Message buffer valid register (BVALR)
• IDE register (IDER)
• Transmission request register (TREQR)
• Transmission RTR register (TRTRR)
• Remote frame receiving wait register (RFWTR)
• Transmission cancel register (TCANR)
• Transmission complete register (TCR)
• Transmission interrupt enable register (TIER)
• Reception complete register (RCR)
• Remote request receiving register (RRTRR)
• Receive overrun register (ROVRR)
• Reception interrupt enable register (RIER)
• Acceptance mask select register (AMSR)
• Acceptance mask registers 0 and 1 (AMR0 and AMR1)
■ Message Buffers
The message buffers are the following 3 registers;
• ID register x (x = 0 to 15) (IDRx)
• DLC register x (x = 0 to 15) (DLCRx)
• Data register x (x = 0 to 15) (DTRx)