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MCP2515
REGISTER 3-1:
TXBnCTRL – TRANSMIT BUFFER n CONTROL REGISTER
(ADDRESS: 30h, 40h, 50h)
U-0
—
R-0
ABTF
R-0
MLOA
R-0
TXERR
R/W-0
TXREQ
U-0
—
R/W-0
TXP1
R/W-0
TXP0
bit 7
Legend:
bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1-0
Unimplemented: Read as ‘ 0 ’
ABTF: Message Aborted Flag bit
1 = Message was aborted
0 = Message completed transmission successfully
MLOA: Message Lost Arbitration bit
1 = Message lost arbitration while being sent
0 = Message did not lose arbitration while being sent
TXERR: Transmission Error Detected bit
1 = A bus error occurred while the message was being transmitted
0 = No bus error occurred while the message was being transmitted
TXREQ: Message Transmit Request bit
1 = Buffer is currently pending transmission
(MCU sets this bit to request message be transmitted - bit is automatically cleared when
the message is sent)
0 = Buffer is not currently pending transmission
(MCU can clear this bit to request a message abort)
Unimplemented: Read as ‘ 0 ’
TXP<1:0>: Transmit Buffer Priority bits
11 = Highest Message Priority
10 = High Intermediate Message Priority
01 = Low Intermediate Message Priority
00 = Lowest Message Priority
DS21801G-page 18
? 2003-2012 Microchip Technology Inc.
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