CP3BT23_14 Datasheet, PDF (158/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
TSEG1[3:0]
1011
1100
1101
1110
1111
Table 18-16. Time Segment 1 Settings (continued)
Length of Time (TSEG1)
12 time quanta
13 time quanta
14 time quanta
15 time quanta
16 time quanta
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TSEG2
The Time Segment 2 field specifies the number of time quanta (tq) for phase segment 2 (see
Table 18-17).
TSEG2
000
001
010
011
100
101
110
111
Table 18-17. Time Segment 2 Settings
Length of TSEG2
1 time quanta
2 time quanta
3 time quanta
4 time quanta
5 time quanta
6 time quanta
7 time quanta
8 time quanta
18.10.8 Global Mask Register (GMSKBn/GMSKXn)
The GMSKBn and GMSKXn registers allow software to globally mask, or “don’t care” the incoming
extended/standard identifier bits, RTR/XRTR and IDE. Throughout this document, the GMSKBn and
GMSKXn 16-bit registers are referenced as a 32-bit register GMSK.
The following are the bits for the GMSKBn register.
15
GM28:18
0
R/W
The following are the bits for the GMSKXn register.
5
4
3
RTR IDE
2
1
0
GM17:15
15
1
0
GM14:0
XRTR
0
R/W
For all GMSKBn and GMSKXn register bits, the following applies:
0 – The incoming identifier bit must match the corresponding bit in the message buffer identifier register.
1 – Accept 1 or 0 (“don’t care”) in the incoming ID bit independent from the corresponding bit in the
message buffer ID registers. The corresponding ID bit in the message buffer will be overwritten by the
incoming identifier bits.
When an extended frame is received from the CAN bus, all GMSK bits GM28:0, IDE, RTR, and XRTR are
used to mask the incoming message. In this case, the RTR bit in the GMSK register corresponds to the
SRR bit in the message. The XRTR bit in the GMSK register corresponds to the RTR bit in the message.
During the reception of standard frames only the GMSK bits GM[28:18], RTR, and IDE are used. In this
case, the GM[28:18] bits in the GMSK register correspond to the ID[10:0] bits in the message.
158 CAN Module
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