CP3BT23 Datasheet, PDF (114/260 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

PRI
The Transmit Priority Code field holds the Note: The maximum number of data bytes received/trans-
software-defined transmit priority code for the mitted is 8, even if the DLC field is set to a value greater than
message buffer.
8. Therefore, if the data length code is greater or equal to
DLC
The Data Length Code field determines the eight bytes, the DLC field is ignored.
number of data bytes within a received/trans-
mitted frame. For transmission, these bits ^{18.10.2 Storage of Standard Messages}
need to be set according to the number of During the processing of standard frames, the Extended-
data bytes to be transmitted. For reception, ^{Identifier (IDE) bit is clear. The ID1[3:0] and ID0[15:0] bits}
these bits indicate the number of valid re- are “don’t care” bits. A standard frame with eight data bytes
ceived data bytes available in the message is shown in Table 47.
buffer. Table 46 shows the possible bit combi- _IDE
nations for DLC3:0 for data lengths from 0 to
8 bytes.
The Identifier Extension bit determines wheth-
er the message is a standard frame or an ex-
tended frame.
Table 46 Data Length Coding
0 – Message is a standard frame using 11
identifier bits.
Address
0E F0XEh
0E F0XCh
0E F0XAh
0E F0X8h
0E F0X6h
0E F0X4h
0E F0X2h
0E F0X0h
DLC
0000
0001
0010
te ⁰⁰¹¹
0100
0101
le ⁰¹¹⁰
0111
1000
Number of Data Bytes
0
1
2
3
4
5
6
7
8
RTR
ID
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 for the 11 standard frame
identifier bits.
o ^{Table 47 Standard Frame with 8 Data Bytes}
Buffer
Register
15
14
13
12
11
10
9
8
7
6
s _ID1
ID0
DATA0
ID[10:0]
Data1[7:0]
Don’t Care
b DATA1
DATA2
DATA3
Data3[7:0]
Data5[7:0]
Data7[7:0]
O^TSTP
TSTP[15:0]
543210
RTR IDE Don’t Care
Data2[7:0]
Data4[7:0]
Data6[7:0]
Data8[7:0]
CNSTAT
DLC
Reserved
PRI
ST
113
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