PIC18F2680ISPSQTP datasheet(330/482 Pages) MICROCHIP

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PIC18F2585/2680/4585/4680

DS39625C-page 328

Preliminary

23.6.3

TRANSMIT PRIORITY

Transmit

priority

prioritization

within

the

PIC18F2585/2680/4585/4680 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

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.

FIGURE 23-2:

TRANSMIT BUFFERS

TXB0

Message

Queue

Control

Transmit Byte Sequencer

TXB1

TXB2

TXB3 - TXB8

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