18F8680 datasheet(287/496 Pages) MICROCHIP

287 / 496 page

 2004 Microchip Technology Inc.

DS30491C-page 285

PIC18F6585/8585/6680/8680

23.2.2

DEDICATED CAN TRANSMIT

BUFFER REGISTERS

This section describes the dedicated CAN Transmit

Buffer registers and their associated control registers.

TXBnCON: TRANSMIT BUFFER n CONTROL REGISTERS [0

≤ n ≤ 2]

Mode 0

U-0

R-0

R/W-0

U-0

R/W-0

—

TXABT

TXLARB

TXERR

TXREQ

—

TXPRI1

TXPRI0

Mode 1, 2

R/C-0

R-0

R/W-0

U-0

R/W-0

TXBIF

TXABT

TXLARB

TXERR

TXREQ

—

TXPRI1

TXPRI0

bit 7

bit 0

bit 7

Mode 0:

Unimplemented: Read as ‘0’

Mode 1, 2:

TXBIF: Transmit Buffer Interrupt Flag bit

= Transmit buffer has completed transmission of message and may be reloaded

= Transmit buffer has not completed transmission of a message

bit 6

TXABT: Transmission Aborted Status bit(1)

= Message was aborted

= Message was not aborted

bit 5

TXLARB: Transmission Lost Arbitration Status bit(1)

= Message lost arbitration while being sent

= Message did not lose arbitration while being sent

bit 4

TXERR: Transmission Error Detected Status bit(1)

= A bus error occurred while the message was being sent

= A bus error did not occur while the message was being sent

bit 3

TXREQ: Transmit Request Status bit(2)

= Requests sending a message. Clears the TXABT, TXLARB, and TXERR bits.

= Automatically cleared when the message is successfully sent

Note:

Clearing this bit in software while the bit is set, will request a message abort.

bit 2

Unimplemented: Read as ‘0’

bit 1-0

TXPRI1:TXPRI0: Transmit Priority bits(3)

= Priority Level 3 (highest priority)

= Priority Level 2

= Priority Level 1

= Priority Level 0 (lowest priority)

Note 1: This bit is automatically cleared when TXREQ is set.

2: While TXREQ is set, Transmit Buffer registers remain read-only.

3: These bits define the order in which transmit buffers will be transferred. They do not

alter the CAN message identifier.

Legend:

U = Unimplemented bit, read as ‘0’

- n = Value at POR

C = Clearable bit

R = Readable bit

W = Writable bit

x = Bit is unknown

‘1’ = Bit is set

‘0’ = Bit is cleared

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