M16CSLASH1N datasheet(148/238 Pages) RENESAS

148 / 238 page

Rev.1.00

Oct 20, 2004

page 136 of 222

M16C/1N Group

16. CAN Module

REJ09B0007-0100Z

16.4 CAN SFR Registers

16.4.1 C0MCTLi Register (i = 0 to 15)

Figure 16.6 shows the C0MCTLi register.

Figure 16.6 C0MCTLi Register

Bit name

Bit symbol

Function

(Note 1)

NewData

Successful

reception flag

SentData

Successful

transmission flag

When set to reception slot

0 : The message is valid.

1 : The message is invalid.

(The message is being updated.)

When set to transmission slot

0 : Transmission is not started or completed yet.

1 : Transmission is successfully completed.

When set to transmission slot

0 : Waiting for bus idle or completion of arbitration.

1 : Transmitting

InvalData

TrmActive

"Under reception"

flag

"Under

transmission" flag

MsgLost

Overwrite flag

Remote frame

transmission/

reception status

flag (Note 2)

0 : Data frame transmission/reception status

1 : Remote frame automatic transfer status

RemActive

RspLock

Transmission/

reception auto

response lock

mode select bit

Remote frame

corresponding

slot select bit

0 : Slot not corresponding to remote frame

1 : Slot corresponding to remote frame

Remote

0 : Not reception slot

1 : Reception slot

RecReq

Reception slot

request bit

(Note 3)

0 : Not transmission slot

1 : Transmission slot

TrmReq

Transmission

slot request bit

(Note 3)

CAN0 message control register i (i = 0 to 15) (Note 4)

Symbol

C0MCTL0 to C0MCTL15

to 022F16

022016

0016

After reset

Address

Note 1: As for write, only writing "0" is possible. The value of each bit is written when the CAN module enters the respective state.

Note 2: In Basic CAN mode, this bit serves as data format identification flag. When receiving a data frame, this bit is set to "0" and

when receiving a remote frame, this bit is set to "1".

Note 3: One slot cannot be defined as reception slot and transmission slot at the same time.

Note 4: This register can not be set in CAN reset/initialization mode of the CAN module.

When set to reception slot

0 : The content of the slot is read or still under

processing by the CPU.

1 : The CAN module has stored new data in the slot.

When set to reception slot

0 : No message has been overwritten in this slot.

1 : This slot already contained a message, but it has

been overwritten by a new one.

When set to reception remote frame slot

0 : After a remote frame is received, it will be

answered automatically.

1 : After a remote frame is received, no transmission

will be started as long as this bit is set to "1".

(Not responding)

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