MCP2515
REGISTER 3-1:
TXBnCTRL – TRANSMIT BUFFER n CONTROL REGISTER
(ADDRESS: 30h, 40h, 50h)
U-0
—
R-0
R-0
R-0
R/W-0
U-0
—
R/W-0
TXP1
R/W-0
TXP0
ABTF
MLOA
TXERR
TXREQ
bit 7
bit 0
bit 7
bit 6
Unimplemented: Read as ‘0’
ABTF: Message Aborted Flag bit
1= Message was aborted
0= Message completed transmission successfully
bit 5
bit 4
bit 3
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)
bit 2
Unimplemented: Read as ‘0’
bit 1-0
TXP: Transmit Buffer Priority <1:0> bits
11= Highest Message Priority
10= High Intermediate Message Priority
11= Low Intermediate Message Priority
00= Lowest Message Priority
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
‘1’ = Bit is set
DS21801D-page 18
Preliminary
© 2005 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
