CP3SP33SMSSLASHNOPB datasheet(201/407 Pages) TI1

201 / 407 page

Storage of Data Bytes

in the Buffer Memory

Sequence of Data Bytes on the Bus

CRC

Data8

Data7

Data6

Data5

Data4

Data3

Data2

Data1

Data7

Data8

Data5

Data6

Data3

Data4

Data1

Data2

Data Bytes

ADDR Offset

DS046

CP3SP33

www.ti.com

SNOSCW5 – MAY 2013

Figure 22-29. Data Direction Bit Set

The Listen Only bit can be used to configure the CAN interface to behave only as a

receiver. This means:

● Cannot transmit any message.

● Cannot send a dominant ACK bit

● When errors are detected on the bus, the CAN module will behave as in the error

passive mode.

Using this listen only function, the CAN interface can be adjusted for connecting to an

operating network with unknown bus speed.

0 – Transmit/receive mode.

1 – Listen-only mode.

When the Ignore Acknowledge bit is set, the CAN module does not expect to receive a

dominant ACK bit to indicate the validity of a transmitted message. It will not send an error

frame when the transmitted frame is not acknowledged by any other CAN node. This

feature can be used in conjunction with the LOOPBACK bit for stand-alone tests outside

of a CAN network.

0 – Normal mode.

1 – The CAN module does not expect to receive a dominant ACK bit to indicate the

validity of a transmitted message.

LOOPBACK

When the Loopback bit is set, all messages sent by the CAN module can also be received

by a CAN module buffer with a matching buffer ID. However, the CAN module does not

acknowledge a message sent by itself. Therefore, the CAN module will send an error

frame when no other device connected to the bus has acknowledged the message.

0 – No loopback.

1 – Loopback enabled.

INTERNAL

If the Internal function is enabled, the CANnTX and CANnRX pins of the CAN module are

internally connected to each other. This feature can be used in conjunction with the

LOOPBACK mode. This means that the CAN module can receive its own sent messages

without connecting an external transceiver chip to the CANnTX and CANnRX pins; it

allows software to run real stand-alone tests without any peripheral devices.

0 – Normal mode.

1 – Internal mode.

DIAGEN

The Diagnostic Enable bit globally enables or disables the special diagnostic features of

the CAN module. This includes the following functions:

● LO (Listen Only)

Dual CAN Interfaces

201

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