M16CSLASH1N datasheet(163/238 Pages) RENESAS

163 / 238 page

Rev.1.00

Oct 20, 2004

page 151 of 222

M16C/1N Group

16. CAN Module

REJ09B0007-0100Z

16.12 Reception and Transmission

Configuration of CAN Reception and Transmission Mode

Table 16.3 shows configuration of CAN reception and transmission mode.

Table 16.3 Configuration of CAN Reception and Transmission Mode

When configuring a slot as a reception slot, note the following points.

(1) Before configuring a slot as a reception slot, be sure to set the C0MCTLi registers (i = 0 to 15) to

"0016".

(2) A received message is stored in a slot that matches the condition first according to the result of

reception mode configuration and acceptance filtering operation. Upon deciding in which slot to

store, the smaller the number of the slot is, the higher priority it has.

(3) In normal CAN operation mode, when a CAN module transmits a message of which ID matches,

the CAN module never receives the transmitted data. In loop back mode, however, the CAN mod-

ule receives back the transmitted data. In this case, the module does not return ACK.

When configuring a slot as a transmission slot, note the following points.

(1) Before configuring a slot as a transmission slot, be sure to set the C0MCTLi registers to "0016".

(2) Set the TrmReq bit to "0" (not transmission slot) before rewriting a transmission slot.

(3) A transmission slot should not be rewritten when the TrmActive bit is "1" (transmitting). If it is

rewritten, an indeterminate data will be transmitted.

TrmReq

Communication environment configuration mode: configure the commu-

nication mode of the slot.

RecReq

Remote

RspLock

Communication mode of the slot

100

Configured as a reception slot for a data frame.

010

Configured as a transmission slot for a remote frame. (At this time the

RemActive bit is "1".)

After completion of transmission, this functions as a reception slot for a

data frame. (At this time the RemActive bit is "0".)

However, when an ID that matches on the CAN bus is detected before

remote frame transmission, this immediately functions as a reception

slot for a data frame.

000

Configured as a transmission slot for a data frame.

1/0

Configured as a reception slot for a remote frame. (At this time the

RemActive bit is "1".)

After completion of reception, this functions as a transmission slot for a

data frame. (At this time the RemActive bit is "0".)

However, transmission does not start as long as RspLock bit remains "1";

thus no automatic remote frame response.

Response (transmission) starts when RspLock bit is set to "0".

TrmReq, RecReq, Remote, RspLock, RemActive, RspLock: C0MCTLi register’s bit

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