MCP2515-ESLASHST datasheet(18/84 Pages) MICROCHIP

18 / 84 page

MCP2515

DS21801D-page 18

Preliminary

TXBnCTRL – TRANSMIT BUFFER n CONTROL REGISTER

(ADDRESS: 30h, 40h, 50h)

U-0

R-0

R/W-0

U-0

R/W-0

—

ABTF

MLOA

TXERR

TXREQ

—

TXP1

TXP0

bit 7

bit 0

bit 7

Unimplemented: Read as ‘0’

bit 6

ABTF: Message Aborted Flag bit

= Message was aborted

= Message completed transmission successfully

bit 5

MLOA: Message Lost Arbitration bit

= Message lost arbitration while being sent

= Message did not lose arbitration while being sent

bit 4

TXERR: Transmission Error Detected bit

= A bus error occurred while the message was being transmitted

= No bus error occurred while the message was being transmitted

bit 3

TXREQ: Message Transmit Request bit

= Buffer is currently pending transmission

(MCU sets this bit to request message be transmitted - bit is automatically cleared when

the message is sent)

= 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

Highest Message Priority

High Intermediate Message Priority

Low Intermediate Message Priority

Lowest Message Priority

Legend:

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

MCP2515-E/ST Datasheet(PDF) 18 Page - Microchip Technology

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