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PIC18C658T-E/CL Datasheet(PDF) 212 Page - Microchip Technology

Part # PIC18C658T-E/CL
Description  High-Performance Microcontrollers with CAN Module
PDF  366 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18C658T-E/CL Datasheet(HTML) 212 Page - Microchip Technology

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PIC18CXX8
DS30475A-page 212
Advanced Information
 2000 Microchip Technology Inc.
FIGURE 17-2: TRANSMIT MESSAGE FLOWCHART
Start
Is
CAN bus available
to start transmission
No
Examine TXPRI <1:0> to
Are any
TXREQ
?
bits = 1
The message transmission sequence begins when
the device determines that the TXREQ for any of the
transmit registers has been set.
Clear: TXABT, TXLARB,
and TXERR
Yes
?
Is
TXREQ = 0
ABAT = 1
Clearing the TXREQ bit while it is set, or setting
the ABAT bit before the message has started
transmission will abort the message.
No
Begin transmission (SOF)
Abort Transmission:
Was
Message Transmitted
Successfully?
No
Yes
Set TXREQ = 0
Is
TXIE = 1?
Generate
Interrupt
Yes
Yes
Set TXABT = 1
Set
Set
TXERR = 1
Yes
No
Determine Highest Priority Message
No
?
Is
TXLARB = 1?
The TXIE bit determines if an inter-
rupt should be generated when a
message is successfully transmitted.
END
is
TXREQ = 0
or TXABT = 1
?
Yes
No
TXBUFE = 1
Yes
A message can also be
aborted
if
a
message
error or lost arbitration
condition occurred during
transmission.
Arbitration lost during
transmission



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