PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 446

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F66K80 FAMILY
27.6.3
Transmit
PIC18F66K80 family devices of the pending transmitta-
ble 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 buf-
fers that are queued for transmission is compared. The
FIGURE 27-2:
DS39977C-page 446
Message
priority
Control
TRANSMIT PRIORITY
Queue
TXB0
is
TRANSMIT BUFFERS
a
prioritization
within
TXB1
Preliminary
the
Transmit Byte Sequencer
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 buffer has
the highest possible priority. If the TXP bits for a partic-
ular message buffer are set to ‘ 00 ’, that buffer has the
lowest possible priority.
TXB2
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TXB3-TXB8