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PIC18F4580-E/ML bảng dữ liệu(PDF) 334 Page - Microchip Technology

tên linh kiện PIC18F4580-E/ML
Giải thích chi tiết về linh kiện  28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
PDF  490 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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PIC18F4580-E/ML bảng dữ liệu(HTML) 334 Page - Microchip Technology

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PIC18F2480/2580/4480/4580
DS39637D-page 334
© 2009 Microchip Technology Inc.
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



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