SH7058F datasheet(13/1130 Pages) RENESAS

13 / 1130 page

Rev. 3.0, 09/04, page x of xxxviii

Item

Page

Revisions (See Manual for Details)

16.3.2 Message Control Field

530-

532

Table amended

Address

Bit

Bit Name

Description

MBx[4], MBx[5]*

H'104 + N x 32

CCM

CAN-ID Compare Match

When this bit is set, message reception

in the corresponding mailbox can

generate two triggers.

If TCR9 is set to 1, TCR14 is cleared to

freeze ICR0. If TCR10 is set to 1,

TCNTR (timer counter register) is

automatically cleared and the LOSR

(local offset register) value is set.

Important: This function is not supported

by the SH7058.

Thus the write value should be 0.

TTE

Time Trigger Enable

When this bit is set, a mailbox in which

TXPR has been already set transmits a

message at a time set in the Tx trigger

time field.

Important: If this bit is set, a failure

occurs during message transmission.

Therefore setting is prohibited. The write

value should be 0. The value read as the

initial value is not guaranteed.

MBx[4], MBx[5]*

H'104 + N x 32

NMC

New Message Control

When this bit is cleared, a mailbox in

which PXPR/PFPR has been already set

does not store the new message but

retains the previous one and sets the

UMSR corresponding bit.

When this bit is set, a mailbox in which

PXPR/PFPR has been already set stores

the new message and sets the UMSR

corresponding bit.

If a message is received in a mailbox in

overwrite mode (NMC = 1), the host CPU

must perform an additional check at the

end of the data reading from the mailbox

in order to guarantee that the mailbox

data have not been corrupted during

such operation by another receive

message. The additional check, to be

performed at the end of the mailbox

access, consists in verifying that the

associated bit of UMSR has not been set

and so no overwrite has occurred; in

case such bit is set data have been

corrupted and so the message must be

discarded.

MBx[4], MBx[5]*

H'104 + N x 32

DART

Disable Automatic Retransmission

When this bit is set, it disables the

automatic retransmission of a message

in the event of an error on the CAN bus

or an arbitration lost on the CAN bus.

When this function is used, the

corresponding TXCR bit is automatically

set at the start of transmission. When

this bit is cleared, the HCAN tries to

transmit the message as many times as

required until it is successfully

transmitted or it is cancelled by the

TXCR.

Important: This function is not supported

by the SH7058.

Thus the write value should be 0.

The value read as the initial value is not

guaranteed.

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