RXB0CTRL datasheet(26/92 Pages) MICROCHIP

26 / 92 page

MCP2515

DS21801G-page 26

 2003-2012 Microchip Technology Inc.

FIGURE 4-3:

RECEIVE FLOW FLOWCHART

Set RXBF0

Start

Detect

Start of

Message?

Valid

Message

Received?

Generate

Error

Meets

a filter criteria

CANINTF.RX0IF = 0?

Go to Start

Move message into RXB0

Set RXB0CTRL.FILHIT <2:0>

CANINTF.RX1IF = 0?

Move message into RXB1

Set CANINTF.RX1IF = 1

Yes

Generate

Interrupt on INT

Yes

Frame

Yes

Begin Loading Message into

Message Assembly Buffer (MAB)

according to which filter criteria

was met

Set RXB0CTRL.FILHIT <0>

according to which filter criteria

Set CANSTAT <3:0> accord-

ing to which receive buffer

the message was loaded into

RXB0CTRL.BUKT = 1?

Generate Overflow Error:

Set EFLG.RX1OVR

CANINTE.ERRIE = 1?

Go to Start

Yes

Are

BFPCTRL.B0BFM = 1

BF1CTRL.B0BFE = 1?

and

Pin = 0

Set RXBF1

Pin = 0

Yes

CANINTE.RX0IE = 1?

CANINTE.RX1IE = 1?

RXB1

RXB0

Set EFLG.RX0OVR

Generate Overflow Error:

Set CANINTF.RX0IF = 1

Are

BFPCTRL.B1BFM = 1

BF1CTRL.B1BFE = 1?

and

Meets

a filter criteria

for RXB1?

for RXB0?

Yes

Generate

Interrupt on INT

Determines if the receive

to accept a new message

Determines if RXB0 can roll

over into RXB1, if it is full.

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