CP3BT13 datasheet(96/232 Pages) NSC

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PRI

The Transmit Priority Code field holds the

software-defined transmit priority code for the

message buffer.

DLC

The Data Length Code field determines the

number of data bytes within a received/trans-

mitted frame. For transmission, these bits

need to be set according to the number of

data bytes to be transmitted. For reception,

these bits indicate the number of valid re-

ceived data bytes available in the message

buffer. Table 43 shows the possible bit combi-

nations for DLC3:0 for data lengths from 0 to

8 bytes.

Note: The maximum number of data bytes received/trans-

mitted is 8, even if the DLC field is set to a value greater than

8. Therefore, if the data length code is greater or equal to

eight bytes, the DLC field is ignored.

16.10.2 Storage of Standard Messages

During the processing of standard frames, the Extended-

Identifier (IDE) bit is clear. The ID1[3:0] and ID0[15:0] bits

are “don’t care” bits. A standard frame with eight data bytes

is shown in Table 44.

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 for the 11 standard frame

identifier bits.

Table 43

Data Length Coding

DLC

Number of Data Bytes

0000

0001

0010

0011

0100

0101

0110

0111

1000

Table 44

Standard Frame with 8 Data Bytes

Address

Buffer

987

65432

0E F0XEh

ID1

ID[10:0]

RTR IDE

Don’t Care

0E F0XCh

ID0

Don’t Care

0E F0XAh

DATA0

Data1[7:0]

Data2[7:0]

0E F0X8h

DATA1

Data3[7:0]

Data4[7:0]

0E F0X6h

DATA2

Data5[7:0]

Data6[7:0]

0E F0X4h

DATA3

Data7[7:0]

Data8[7:0]

0E F0X2h

TSTP

TSTP[15:0]

0E F0X0h

CNSTAT

DLC

Reserved

PRI

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