PIC18F258-ESLASHLSQTP datasheet(231/402 Pages) MICROCHIP

Part #	PIC18F258-E/LSQTP

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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231 / 402 page

DS41159E-page 229

PIC18FXX8

FIGURE 19-3:

INTERNAL TRANSMIT MESSAGE FLOWCHART

Start

Is CAN bus

Available to Start

Transmission?

Examine TXPRI <1:0> to

Are any

TXREQ

bits = 1?

The message transmission sequence begins when

the device determines that the TXREQ for any of the

transmit registers has been set.

Clear: TXABT, TXLARB

and TXERR

Yes

TXREQ = 0

ABAT = 1?

Clearing the TXREQ bit while it is set, or setting

the ABAT bit before the message has started

transmission, will abort the message.

Begin Transmission (SOF)

Abort Transmission:

Was

Message Transmitted

Successfully?

Yes

Set TXREQ = 0

TXIE = 1?

Generate

Interrupt

Yes

Set TXABT = 1

Set

TXERR = 1

Yes

Determine Highest Priority Message

TXLARB = 1?

The TXIE bit determines if an inter-

rupt should be generated when a

message is successfully transmitted.

END

TXREQ = 0

or TXABT = 1?

Yes

TXBUFE = 1

Yes

A message can also be

aborted

message

error or lost arbitration

condition occurred during

transmission.

Arbitration Lost During

Transmission

PIC18F258-E/LSQTP Datasheet(PDF) 231 Page - Microchip Technology

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