PIC18F258-ESLASHSOSQTP datasheet(233/402 Pages) MICROCHIP

Part #	PIC18F258-E/SOSQTP

Description	28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PDF	402 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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233 / 402 page

DS41159E-page 231

PIC18FXX8

FIGURE 19-5:

INTERNAL MESSAGE RECEPTION FLOWCHART

Start

Detect

Start of

Message?

Valid

Message

Received?

Generate

Error

Message

Identifier meets a

Filter Criteria?

RXFUL = 0?

Go to Start

Move Message into RXB0

Set RXRDY = 1

Set FILHIT <2:0>

RXFUL = 0?

Move Message into RXB1

Set RXRDY = 1

Yes, meets criteria

for RXBO

Yes, meets criteria

for RXB1

Generate

Interrupt

Yes

Frame

The RXFUL bit determines if the

receive register is empty and able

to accept a new message.

Yes

Generate Overrun Error:

Begin Loading Message into

Message Assembly Buffer (MAB)

according to which Filter

Criteria was met

RXIE = 1?

RX0DBEN = 1?

The RXB0DBEN bit determines if

RXB0 can rollover into RXB1 if it is

full.

Set RXB0OVFL

Generate Overrun Error:

Set RXB1OVFL

ERRIE = 1?

Go to Start

Yes

Set FILHIT <0>

according to which Filter

Criteria was met

Set CANSTAT <3:0> according

to which Receive Buffer the

Message was loaded into

PIC18F258-E/SOSQTP Datasheet(PDF) 233 Page - Microchip Technology

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