CP3BT26 Datasheet, PDF (132/278 Pages) National Semiconductor (TI) – Reprogrammable Connectivity Processor with Bluetooth-R, USB, and CAN Interfaces

19.10.5 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 56.
Address
Buffer
Register
15
0E F0XEh
0E F0XCh
0E F0XAh
0E F0X8h
0E F0X6h
0E F0X4h
0E F0X2h
0E F0X0h
ID1
ID0
DATA0
DATA1
DATA2
DATA3
TSTP
CNSTAT
Table 56 Extended Remote Frame
14 13 12 11 10 9 8 7 6 5 4 3
ID[28:18]
ID[14:0]
SRR IDE
Don’t Care
DLC
TSTP
Reserved
PRI
210
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 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.
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