PIC18F2685T-I/SP 查看數據表（PDF） - Microchip Technology

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PIC18F2685T-I/SP

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

Microchip Technology 

PIC18F2682/2685/4682/4685

23.6.3 TRANSMIT PRIORITY

Transmit priority is a prioritization within the

PIC18F2682/2685/4682/4685 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 SOF, the priority of all buffers that are

queued for transmission is compared. The transmit

FIGURE 23-2:

TRANSMIT BUFFERS

TXB0

TXB1

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 TXP bits for a particular

message buffer are set to ‘11’, that buffer has the high-

est possible priority. If 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

© 2007 Microchip Technology Inc.

Preliminary

DS39761B-page 329

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