Microchip Technology DM164134 Data Sheet

© 2006 Microchip Technology Inc.

DS41159E-page 231

Start

Detect

Start of

Message?

Valid

Message

Received?

Generate

Error 

Message

Identifier meets a

Filter Criteria?

Is

RXFUL = 0?

Go to Start

Move Message into RXB0

Set RXRDY = 1

Set FILHIT <2:0>

Is

RXFUL = 0?

Move Message into RXB1

Set RXRDY = 1

Yes, meets criteria

for RXBO

Yes, meets criteria

for RXB1

No

Generate

Interrupt

Yes

Yes

No

No

Yes

Yes

No

No

Yes

Yes

Frame

The RXFUL bit determines if the
receive register is empty and able
to accept a new message.

No

Yes

No

Generate Overrun Error:

Begin Loading Message into

Message Assembly Buffer (MAB)

according to which Filter

Criteria was met

Is

RXIE = 1?

Is

RXIE = 1?

Is

RX0DBEN = 1?

The RXB0DBEN bit determines if
RXB0 can rollover into RXB1 if it is
full.

Set RXB0OVFL

Generate Overrun Error:

Set RXB1OVFL

Is

ERRIE = 1?

No

Go to Start

Yes

No

Set FILHIT <0>

according to which Filter

Criteria was met

Set CANSTAT <3:0> according

to which Receive Buffer the

Message was loaded into