CP3BT23_14 Datasheet, PDF (151/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
www.ti.com
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
Note: The maximum number of data bytes received/transmitted 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.
18.10.2 Storage of Standard Messages
During the processing of standard frames, the ExtendedIdentifier (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 18-11.
IDE
RTR
ID
The Identifier Extension bit determines whether the message is a standard frame or an extended
frame.
0 – Message is a standard frame using 11 identifier bits.
1 – Message is an extended frame.
The Remote Transmission Request bit indicates 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 18-11. Standard Frame with 8 Data Bytes
Address
Buffer
Register
15
0E
F0XEh
ID1
0E
F0XCh
ID0
0E
F0XAh
DATA0
0E
F0X8h
DATA1
0E
F0X6h
DATA2
0E
F0X4h
DATA3
0E
F0X2h
TSTP
0E
F0X0h
CNSTAT
14 13 12 11 10 9
ID[10:0]
Data1[7:0]
Data3[7:0]
Data5[7:0]
Data7[7:0]
DLC
Reserved
8
7
Don’t Care
TSTP[15:0]
6
5
4
3
2
1
0
RTR IDE
Don’t Care
Data2[7:0]
Data4[7:0]
Data6[7:0]
Data8[7:0]
PRI
ST
18.10.3 Storage of Messages with Less Than 8 Data Bytes
The data bytes that are not used for data transfer are “don’t cares”. If the object is transmitted, the data
within these bytes will be ignored. If the object is received, the data within these bytes will be overwritten
with invalid data.
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