PIC18F45K80-I Datasheet, PDF (400/622 Pages) Microchip Technology – 28/40/44/64-Pin, Enhanced Flash Microcontrollers with ECAN and nanoWatt XLP Technology

PIC18F66K80 FAMILY
27.2.2
DEDICATED CAN TRANSMIT
BUFFER REGISTERS
This section describes the dedicated CAN Transmit
Buffer registers and their associated control registers.
REGISTER 27-5: TXBnCON: TRANSMIT BUFFER n CONTROL REGISTERS [0  n  2]
Mode 0
U-0
R-0
R-0
R-0
R/W-0
U-0
R/W-0
R/W-0
TXBIF
TXABT⁽¹⁾ TXLARB⁽¹⁾ TXERR⁽¹⁾ TXREQ⁽²⁾
—
TXPRI1⁽³⁾ TXPRI0⁽³⁾
R/C-0
R-0
R-0
R-0
R/W-0
U-0
R/W-0
R/W-0
Mode 1,2
TXBIF
TXABT⁽¹⁾ TXLARB⁽¹⁾ TXERR⁽¹⁾ TXREQ⁽²⁾
—
TXPRI1⁽³⁾ TXPRI0⁽³⁾
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
C = Clearable bit
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1-0
TXBIF: Transmit Buffer Interrupt Flag bit
1 = Transmit buffer has completed transmission of a message and may be reloaded
0 = Transmit buffer has not completed transmission of a message
TXABT: Transmission Aborted Status bit⁽¹⁾
1 = Message was aborted
0 = Message was not aborted
TXLARB: Transmission Lost Arbitration Status bit⁽¹⁾
1 = Message lost arbitration while being sent
0 = Message did not lose arbitration while being sent
TXERR: Transmission Error Detected Status bit⁽¹⁾
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⁽²⁾
1 = Requests sending a message; clears the TXABT, TXLARB and TXERR bits
0 = Automatically cleared when the message is successfully sent
Unimplemented: Read as ‘0’
TXPRI<1:0>: Transmit Priority bits⁽³⁾
11 = Priority Level 3 (highest priority)
10 = Priority Level 2
01 = Priority Level 1
00 = Priority Level 0 (lowest priority)
Note 1:
2:
3:
This bit is automatically cleared when TXREQ is set.
While TXREQ is set, Transmit Buffer registers remain read-only. Clearing this bit in software while the bit is
set will request a message abort.
These bits define the order in which transmit buffers will be transferred. They do not alter the CAN
message identifier.
DS39977F-page 400
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