M16CSLASH29 datasheet(311/499 Pages) RENESAS

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17. CAN Module

page 287

17. CAN Module

The CAN (Controller Area Network) module for the M16C/29 Group of MCUs is a communication controller

implementing the CAN 2.0B protocol. The M16C/29 Group contains one CAN module which can transmit

and receive messages in both standard (11-bit) ID and extended (29-bit) ID formats.

Figure 17.1

shows a block diagram of the CAN module.

External CAN bus driver and receiver are required.

Figure 17.1 Block Diagram of CAN Module

CTx/CRx:

CAN I/O pins.

Protocol controller:

This controller handles the bus arbitration and the CAN protocol services, i.e. bit

timing, stuffing, error status etc.

Message box:

This memory block consists of 16 slots that can be configured either as transmitter

or receiver. Each slot contains an individual ID, data length code, a data field

(8 bytes) and a time stamp.

Acceptance filter:

This block performs filtering operation for received messages. For the filtering

operation, the C0GMR register, the C0LMAR register, or the C0LMBR register is

used.

16 bit timer:

Used for the time stamp function. When the received message is stored in the

message memory, the timer value is stored as a time stamp.

Wake-up function:

CAN0 wake-up interrupt request is generated by a message from the CAN bus.

Interrupt generation function: The interrupt requests are generated by the CAN module. CAN0 successful

reception interrupt, CAN0 successful transmission interrupt, CAN0 error interrupt

and CAN0 wake-up interrupt.

C0CONR Register

C0CTLR Register

C0IDR Register

j = 0 to 15

Interrupt

Generation

Function

Message Box

slots 0 to 15

Message ID

DLC

Message Data

Time Stamp

CTX

CRX

C0GMR Register

C0LMAR Register

C0LMBR Register

CAN0 Successful Reception Int

CAN0 Successful Transmission Int

CAN0 Error Int

CAN0 Wake-Up Int

Data Bus

C0MCTLj Register

C0TSR Register

16 Bit Timer

Acceptance Filter

slots 0 to 15

Protocol

Controller

Wake Up

Function

C0SSTR Register

C0ICR Register

C0STR Register

C0RECR Register

C0TECR Register

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