PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 190
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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PIC18CXX8
17.2.2
This section describes the CAN Transmit Buffer Register
and the associated Transmit Buffer Control Registers.
REGISTER 17-4:
REGISTER 17-5:
DS30475A-page 190
CAN TRANSMIT BUFFER REGISTERS
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1-0
bit 7-0
TXBnCON – TRANSMIT BUFFER n CONTROL REGISTER
TXBnSIDH: TRANSMIT BUFFER n STANDARD IDENTIFIER HIGH BYTE REGISTER
bit 7
SID10:SID3: Standard Identifier bits, if EXIDE = 0 (TXBnSID Register).
Extended Identifier bits EID28:EID21, if EXIDE = 1.
bit 7
Legend:
R = Readable bit
- n = Value at POR
Unimplemented: Read as ’0’
TXABT: Transmission Aborted Status bit
1 = Message was aborted
0 = Message was not aborted
TXLARB: Transmission Lost Arbitration Status bit
1 = Message lost arbitration while being sent
0 = Message did not lose arbitration while being sent
TXERR: Transmission Error Detected Status bit
1 = A bus error occurred while the message was being sent
0 = A bus error did not occur while the message was being sent
TXREQ: Transmit Request Status bit
1 = Requests sending a message. Clears the TXABT, TLARB, and TXERR bits
0 = Automatically cleared when the message is successfully sent
Unimplemented: Read as ’0’
TXPRI1:TXPRI0: Transmit Priority bits
11 = Priority Level 3 (Highest Priority)
10 = Priority Level 2
01 = Priority Level 1
00 = Priority Level 0 (Lowest Priority)
Legend:
R = Readable bit
- n = Value at POR
R/W-x
SID10
Note:
Note:
U-0
—
Clearing this bit in software, while the bit is set, will request a message abort.
These bits set the order in which Transmit buffer will be transferred. They do not
alter CAN message identifier.
TXABT
R/W-x
SID9
R-0
Advanced Information
’1’ = Bit is set
W = Writable bit
W = Writable bit
’1’ = Bit is set
TXLARB
R/W-x
SID8
R-0
TXERR
R/W-x
SID7
R-0
U = Unimplemented bit, read as ‘0’
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
’0’ = Bit is cleared
TXREQ
R/W-x
R/W-0
SID6
R/W-x
SID5
U-0
—
2000 Microchip Technology Inc.
x = Bit is unknown
x = Bit is unknown
TXPRI1
R/W-0
R/W-x
SID4
TXPRI0
R/W-0
R/W-x
SID3
bit 0
bit 0
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