CP3BT23_14 Datasheet, PDF (159/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

CP3BT23
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Global
Mask
Standard
Frame
Extended
Frame
GM[28:18]
ID[10:0]
ID[28:18]
RTR
RTR
SRR
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
IDE
GM[17:0]
XRTR
IDE
Unused
IDE
ID[17:0]
RTR
18.10.9 Basic Mask Register (BMSKBn/BMSKXn)
The BMSKBn and BMSKXn registers allow masking the buffer 14, or “don’t care” the incoming
extended/standard identifier bits, RTR/XRTR, and IDE. Throughout this document, the two 16-bit registers
BMSKBn and BMSKXn are referenced to as a 32-bit register BMSK. The following are the bits for the
BMSKB register.
15
BM28:18
0
R/W
The following are the bits for the BMSKX register.
5
4
3
RTR IDE
2
1
0
BM17:15
15
1
0
BM14:0
XRTR
0
R/W
For all BMSKBn and BMSKXn 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 BMSK bits BM28:0, IDE, RTR, and XRTR are
used to mask the incoming message. In this case, the RTR bit in the BMSK register corresponds to the
SRR bit in the message. The XRTR bit in the BMSK register corresponds to the RTR bit in the message.
During the reception of standard frames, only the BMSK bits BM[28:18], RTR, and IDE are used. In this
case, the BM[28:18] bits in the BMSK register correspond to the ID[10:0] bits in the message.
Basic Mask
BM28:18
RTR
IDE
BM17:0
XRTR
Standard
Frame
ID10:0
RTR
IDE
Unused
Extended
Frame
ID28:18
SRR
IDE
ID17:0
RTR
18.10.10 CAN Interrupt Enable Register (CIENn)
The CIENn register enables the transmit/receive interrupts of the message buffers 0 through 14 as well as
the CAN Error Interrupt.
15
14
0
EIEN
IEN
0
R/W
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