PIC18F6585 Datasheet, PDF (291/496 Pages) Microchip Technology – 64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module

PIC18F6585/8585/6680/8680
EXAMPLE 23-3: TRANSMITTING A CAN MESSAGE USING BANKED METHOD
; Need to transmit Standard Identifier message 123h using TXB0 buffer.
; To successfully transmit, CAN module must be either in Normal or Loopback mode.
; TXB0 buffer is not in access bank. And since we want banked method, we need to make sure
; that correct bank is selected.
BANKSEL TXB0CON
; One BANKSEL in beginning will make sure that we are
; in correct bank for rest of the buffer access.
; Now load transmit data into TXB0 buffer.
MOVLW MY_DATA_BYTE1
; Load first data byte into buffer
MOVWF TXB0D0
; Compiler will automatically set “BANKED” bit
; Load rest of data bytes - up to 8 bytes into TXB0 buffer.
...
; Load message identifier
MOVLW 60H
; Load SID2:SID0, EXIDE = 0
MOVWF TXB0SIDL
MOVLW 24H
; Load SID10:SID3
MOVWF TXB0SIDH
; No need to load TXB0EIDL:TXB0EIDH, as we are transmitting Standard Identifier Message only.
; Now that all data bytes are loaded, mark it for transmission.
MOVLW B’00001000’
; Normal priority; Request transmission
MOVWF TXB0CON
; If required, wait for message to get transmitted
BTFSC TXB0CON, TXREQ
; Is it transmitted?
BRA
$-2
; No. Continue to wait...
; Message is transmitted.
 2004 Microchip Technology Inc.
DS30491C-page 289