PIC18F2680ISPSQTP datasheet(296/482 Pages) MICROCHIP

296 / 482 page

PIC18F2585/2680/4585/4680

DS39625C-page 294

Preliminary

23.2.3.1

Programmable TX/RX and

Auto-RTR Buffers

The ECAN module contains 6 message buffers that can

be programmed as transmit or receive buffers. Any of

these buffers can also be programmed to automatically

handle RTR messages.

≤ n ≤ 5, TXnEN (BSEL0<n>) = 0](1)

Note:

These registers are not used in Mode 0.

R/W-0

R-0

RXFUL(2)

RXM1

RXRTRRO

FILHIT4

FILHIT3

FILHIT2

FILHIT1

FILHIT0

bit 7

bit 0

bit 7

RXFUL: Receive Full Status bit(2)

= Receive buffer contains a received message

= Receive buffer is open to receive a new message

bit 6

RXM1: Receive Buffer Mode bit

= Receive all messages including partial and invalid (acceptance filters are ignored)

= Receive all valid messages as per acceptance filters

bit 5

RXRTRRO: Read-Only Remote Transmission Request for Received Message bit

= Received message is a remote transmission request

= Received message is not a remote transmission request

bit 4-0

FILHIT4:FILHIT0: Filter Hit bits

These bits indicate which acceptance filter enabled the last message reception into this buffer.

01111

= Acceptance Filter 15 (RXF15)

01110

= Acceptance Filter 14 (RXF14)

...

00001

= Acceptance Filter 1 (RXF1)

00000

= Acceptance Filter 0 (RXF0)

Note 1: These registers are available in Mode 1 and 2 only.

2: This bit is set by the CAN module upon receiving a message and must be cleared

by software after the buffer is read. As long as RXFUL is set, no new message will

be loaded and the buffer will be considered full.

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

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