CP3BT23_14 Datasheet, PDF (153/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
www.ti.com
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
18.10.5 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 18-13. Extended Remote Frame
Address
Buffer
Register
15
14
13
12
11
10
9
8
7
0E
F0XEh
ID1
ID[28:18]
0E
F0XCh
ID0
ID[14:0]
0E
F0XAh
DATA0
0E
F0X8h
0E
F0X6h
DATA1
DATA2
Don't Care
0E
F0X4h
DATA3
0E
F0X2h
TSTP
TSTP
0E
F0X0h
CNSTAT
DLC
Reserved
6
5
4
3
2
1
0
SRR IDE
ID17:15]
RTR
PRI
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.
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. The ID[28:18] field is
used for the 11 standard frame identifier bits.
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