PIC18F4580-ESLASHML datasheet(334/490 Pages) MICROCHIP

Part #	PIC18F4580-E/ML

Description	28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology

PDF	490 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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334 / 490 page

PIC18F2480/2580/4480/4580

DS39637D-page 334

24.6.3

TRANSMIT PRIORITY

Transmit priority is a prioritization within the

PIC18F2480/2580/4480/4580 devices of the pending

transmittable messages. This is independent from and

not related to any prioritization implicit in the message

arbitration scheme built into the CAN protocol. Prior to

sending the Start-Of-Frame (SOF), the priority of all

buffers that are queued for transmission is compared.

The transmit buffer with the highest priority will be sent

first. If two buffers have the same priority setting, the

buffer with the highest buffer number will be sent first.

There are four levels of transmit priority. If the TXP bits

for a particular message buffer are set to ‘11’, that buf-

fer has the highest possible priority. If the TXP bits for

a particular message buffer are set to ‘00’, that buffer

has the lowest possible priority.

FIGURE 24-2:

TRANSMIT BUFFERS

TXB0

Message

Queue

Control

Transmit Byte Sequencer

TXB1

TXB2

TXB3 - TXB8

PIC18F4580-E/ML Datasheet(PDF) 334 Page - Microchip Technology