PIC18F4580ISOSQTP 데이터 시트보기 (PDF) - Microchip Technology

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PIC18F4580ISOSQTP

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

Microchip Technology 

PIC18F2480/2580/4480/4580

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.

FIGURE 24-2:

TRANSMIT BUFFERS

TXB0

TXB1

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.

TXB2

TXB3 - TXB8

Message

Queue

Control

Transmit Byte Sequencer

DS39637D-page 334

© 2009 Microchip Technology Inc.

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