CP3BT23_14 Datasheet, PDF (152/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
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18.10.4 Storage of Extended Messages
If the IDE bit is set, the buffer handles extended frames. The storage of the extended ID follows the
descriptions in . The SRR bit is at the bit position of the RTR bit for standard frame and needs to be
transmitted as 1.
Table 18-12. Extended Messages 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
8
7
ID[28:18]
ID[14:0]
Data1[7:0]
Data3[7:0]
Data5[7:0]
Data7[7:0]
TSTP[15:0]
DLC
Reserved
6
5
4
3
SRR IDE
Data2[7:0]
Data4[7:0]
Data6[7:0]
Data8[7:0]
PRI
2
1
0
ID17:15]
RTR
ST
SRR
IDE
RTR
ID
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 software if the buffer is configured to transmit a
message with an extended identifier. It will be received as monitored on the CAN bus.
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 to build the 29-bit identifier of an extended frame.
152 CAN Module
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