M16CSLASH1N datasheet(143/238 Pages) RENESAS

143 / 238 page

Rev.1.00

Oct 20, 2004

page 131 of 222

M16C/1N Group

16. CAN Module

REJ09B0007-0100Z

16. CAN Module

The CAN (Controller Area Network) module for the M16C/1N group of microcomputers is a communication

controller implementing the CAN 2.0B protocol. The M16C/1N group contains one Full CAN module which

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

Figure 16.1 shows a block diagram of the CAN module.

External CAN bus driver and receiver are required.

Figure 16.1 Block Diagram of CAN Module

CTx/CRx:

CAN I/O pins. Either P02, P03 or P50, P51 can be selected as CAN I/O pins by a

program.

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 op-

eration, 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 is generated by a message from the CAN bus.

Interrupt generation function: The interrupt events are provided by the CAN module. CAN0 successful reception

interrupt, CAN0 successful transmission interrupt, CAN0 error interrupt, and

CAN0 wake up interrupt.

CTX

CRX

CAN0 reception-

successful interrupt

CAN0 transmission-

successful interrupt

CAN0 Control

CAN0 Extended

ID Register

Protocol

Controller

Wakeup

Logic

Data Bus

CAN0 Mailbox

Control Register 15

CAN0 Mailbox

Control Register 1

CAN0 Mailbox

Control Register 0

CAN0 Global

Mask Register

CAN0 Local

Mask A Register

CAN0 Local

Mask B Register

Mailboxes

Mailbox 0

Mailbox 1

Mailbox 2

Mailbox 14

Mailbox 15

CAN0 Status

CAN0 Interrupt

Control Register

Interrupt

Control Logic

16-bit

Timer

CAN0 error interrupt

CAN0 wakeup interrupt

Acceptance Filter

CAN0 TEC

CAN0 REC

CAN0 Configuration

CAN0 Mailbox

Status Register

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