CP3SP33SMSSLASHNOPB datasheet(204/407 Pages) TI1

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CP3SP33

SNOSCW5 – MAY 2013

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GM[28:18]

RTR

IDE

GM[17:15]

R/W

The following are the bits for the GMSKXn register.

GM[14:0]

XRTR

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

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 GMSKn bits GM28:0, IDE, RTR, and XRTR

are used to mask the incoming message. In this case, the RTR bit in the GMSKn register corresponds to

the SRR bit in the message. The XRTR bit in the GMSKn register corresponds to the RTR bit in the

message.

During the reception of standard frames only the GMSKn bits GM28:18, RTR, and IDE are used. In this

case, the GM28:18 bits in the GMSKn register correspond to the ID10:0 bits in the message.

Global Mask

GM28:18

RTR

IDE

GM17:0

XRTR

Standard Frame

ID10:0

RTR

IDE

Unused

Extended Frame

ID28:18

SRR

IDE

ID17:0

RTR

22.10.9 CAN Basic Mask Register n (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 as a 32-bit register BMSKn.

The following are the bits for the BMSKXn register.

bM[28:18]

RTR

IDE

BM[17:15]

R/W

The following are the bits for the BMSKXn register.

BM[14:0]

XRTR

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

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.

204

Dual CAN Interfaces

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