CP3BT23 Datasheet, PDF (116/260 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

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 49.
Table 49 Extended Remote Frame
Address
Buffer
Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0E F0XEh ID1
ID[28:18]
SRR IDE ID17:15]
0E F0XCh ID0
ID[14:0]
RTR
0E F0XAh DATA0
0E F0X8h DATA1
Don’t Care
0E F0X6h DATA2
0E F0X4h DATA3
0E F0X2h TSTP
TSTP
0E F0X0h CNSTAT
DLC
Reserved
PRI
ST
te ^SRR
IDE
le _RTR
Obso ^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 soft-
ware.
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.
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.
115
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