Mask Bit n

0

1

1

1

1

Filter Bit n

x

0

0

1

1

Accept or Reject bit n

Accept

Accept

Reject

Reject

Accept

Message Identifiere bit

x

0

1

0

1

APPLICATION NOTES CONT'D

APPLICATION NOTES CONT'D

6

Set CAN Mask - Sets the mask bits for the CAN module. For filtering CAN messages.

Send Contents: Command Tag followed by 40 bits of data. Data = First 16 represent the SID bits. The upper 5 bits are ignored. The

remaining 24 bits represent the EID. The upper 6 bits are ignored. When used with an EID, the SID bits and EID bits are combined

with the SID bits being most significant [6 words].

Command Tag: 0x22

Data: 0x00 0000 0000 – 0xFF FFFF FFFF

Response Contents: Response Tag only [1 word].

Response Tag: 0x23

Description: The CAN Mask works with the CAN Filter 1 and 2 in order to decide which messages are meant to be accepted by the controller.

If a given mask bit is set, the corresponding bit in the filter will be used to filter messages. If it is not set, the corresponding bit in the filter

will be ignored. The value is stored in non-volatile memory and does not have to be re-introduced every time the device is powered up.

Default Data Value: 0x00 0000 0000

Set CAN Filter 1 - Sets the filter 1 bits for the CAN module. For filtering CAN messages.

Send Contents: Command Tag followed by 40 bits of data. Data = First 16 represent the SID bits. The upper 5 bits are ignored.

The remaining 24 bits represent the EID. The upper 6 bits are ignored. When used with an EID, the SID bits and EID bits are

combined with the SID bits being most significant [6 words].

Command Tag: 0x24

Data: 00 0000 0000 – 0xFF FFFF FFFF

Response Contents: Response Tag only [1 word].

Response Tag = 0x25

Description: The CAN Filter works with the CAN mask in order to decide which messages are meant to be read by the controller. If a given

mask bit is set, the corresponding bit in the filter will be used to filter messages. If it is not set, the corresponding bit in the filter will be

ignored. The value is stored in non-volatile memory and does not have to be re-introduced every time the device is powered up.

Mask Bit n

0

1

1

1

1

Filter Bit n

x

0

0

1

1

Accept or Reject bit n

Accept

Accept

Reject

Reject

Accept

Message Identifiere bit

x

0

1

0

1

Default Data Value: 0xFF FFFF FFFF

Set CAN Filter 2 - Sets the filter 2 bits for the CAN module. For filtering CAN messages.

Send Contents: Command Tag followed by 40 bits of data. Data = First 16 represent the SID bits. The upper 5 bits are ignored.

The remaining 24 bits represent the EID. The upper 6 bits are ignored. When used with an EID, the SID bits and EID bits are

combined with the SID bits being most significant [6 words].

Command Tag: 0x26

Data: 0x00 0000 0000 – 0xFF FFFF FFFF

Response Contents: Response Tag only [1 word].

Response Tag = 0x27

Description: The CAN Filter works with the CAN mask in order to decide which messages are meant to be read by the controller. If a given

mask bit is set, the corresponding bit in the filter will be used to filter messages. If it is not set, the corresponding bit in the filter will be

ignored. The value is stored in non-volatile memory and does not have to be re-introduced every time the device is powered up.

Default Data Value: 0xFF FFFF FFFF

8548-120 Rev. A 4/14