RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 14 CAN CONTROLLER 14.1.3 Configuration The CAN controller is composed of the following four blocks. (1) Interface This functional block provides an internal bus interface and means of transmitting and receiving signals between the CAN module and the host CPU. (2) MCM (Memory Control Module) This functional block controls access to the CAN protocol layer and to the CAN RAM within the CAN module. (3) CAN protocol layer This functional block is involved in the operation of the CAN protocol and its related settings. (4) CAN RAM This is the CAN memory functional block, which is used to store message IDs, message data, etc. Interrupt request INTCnTRX INTCnREC INTCnERR INTCnWUP (n = 0, 1) CPU Interface Figure 14-1. Block Diagram of CAN Module n CAN module n CAN RAM Internal Bus MCM (Memory Control Module) Message buffer 0 Message buffer 1 Message buffer 2 Message buffer 3 ... Message buffer 15 CMASK1 CMASK2 CMASK3 CMASK4 CAN Protocol Layer R01UH0317EJ0004 Rev. 0.04 785 Feb. 22, 2013 CTxDn CRxDn CAN transceiver CAN_H CAN_L CAN bus
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 14 CAN CONTROLLER 14.2 CAN Protocol CAN (Controller Area Network) is a high-speed multiplex communication protocol for real-time communication in automotive applications (class C). CAN is prescribed by ISO 11898. For details, refer to the ISO 11898 specifications. The CAN specification is generally divided into two layers: a physical layer and a data link layer. In turn, the data link layer includes logical link and medium access control. The composition of these layers is illustrated below. Higher Lower 14.2.1 Frame format Data link layer Note · Logical link control (LLC) Figure 14-2. Composition of Layers · Medium access control (MAC) · Acceptance filtering · Overload report · Recovery management · Data capsuled/not capsuled · Frame coding (stuffing/not stuffing) · Medium access management · Error detection · Error report · Acknowledgement · Seriated/not seriated Physical layer Prescription of signal level and bit description Note CAN controller specification (1) Standard format frame - The standard format frame uses 11-bit identifiers, which means that it can handle up to 2048 messages. (2) Extended format frame - The extended format frame uses 29-bit (11 bits + 18 bits) identifiers which increase the number of messages that can be handled to 2048 x 218 messages. - Extended format frame is set when “recessive level” (CMOS level equals “1”) is set for both the SRR and IDE bits in the arbitration field. R01UH0317EJ0004 Rev. 0.04 786 Feb. 22, 2013
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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