CP3BT13 datasheet(98/232 Pages) NSC

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16.10.5 Storage of Remote Messages

During remote frame transfer, the buffer registers DATA0–

DATA3 are “don’t cares”. If a remote frame is transmitted,

the contents of these registers are ignored. If a remote

frame is received, the contents of these registers will be

overwritten with invalid data. The structure of a message

buffer set up for a remote frame with extended identifier is

shown in Table 46.

SRR

The Substitute Remote Request bit replaces

the RTR bit used in standard frames at this bit

position. The SRR bit needs to be set by soft-

ware.

IDE

The Identifier Extension bit determines wheth-

er the message is a standard frame or an ex-

tended frame.

0 – Message is a standard frame using 11

identifier bits.

1 – Message is an extended frame.

RTR

The Remote Transmission Request bit indi-

cates whether the message is a data frame or

a remote frame.

0 – Message is a data frame.

1 – Message is a remote frame.

The ID field is used to build the 29-bit identifier

of an extended frame. The ID[28:18] field is

used for the 11 standard frame identifier bits.

Table 46

Extended Remote Frame

Address

Buffer

0E F0XEh

ID1

ID[28:18]

SRR IDE

ID17:15]

0E F0XCh

ID0

ID[14:0]

RTR

0E F0XAh

DATA0

Don’t Care

0E F0X8h

DATA1

0E F0X6h

DATA2

0E F0X4h

DATA3

0E F0X2h

TSTP

0E F0X0h

CNSTAT

DLC

Reserved

PRI

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