SH7261 datasheet(845/1348 Pages) RENESAS

845 / 1348 page

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 813 of 1312

REJ09B0320-0200

(3)

Mailbox Control

The Mailbox Control handles the following functions:

• For received messages, compare the IDs and generate appropriate RAM addresses/data to store

messages from the CAN Interface into the Mailbox and set/clear appropriate registers

accordingly.

• To transmit messages, RCAN-ET will run the internal arbitration to pick the correct priority

message, and load the message from the Mailbox into the Tx-buffer of the CAN Interface and

set/clear appropriate registers accordingly.

• Arbitrates Mailbox accesses between the CPU and the Mailbox Control.

• Contains registers such as TXPR, TXCR, TXACK, ABACK, RXPR, RFPR, UMSR and

MBIMR.

(4)

CAN Interface

This block conforms to the requirements for a CAN Bus Data Link Controller which is specified

in Ref. [3, 5]. It fulfils all the functions of a standard Data Link Controller as specified by the OSI

7 Layer Reference model. This functional entity also provides the registers and the logic which are

specific to a given CAN bus, which includes the Receive Error Counter, Transmit Error Counter,

the Bit Configuration Registers and various useful Test Modes. This block also contains functional

entities to hold the data received and the data to be transmitted for the CAN Data Link Controller.

19.2.3

Input/Output Pins

Table 19.1 shows the pin configuration of the RCAN-ET.

Table 19.1

Pin Configuration

Channel

Name

Abbreviation

I/O

Function

Transmit data pin

CTx0

Output

CAN-bus transmit pin

Receive data pin

CRx0

Input

CAN-bus receive pin

Transmit data pin

CTx1

Output

CAN-bus transmit pin

Receive data pin

CRx1

Input

CAN-bus receive pin

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