Datasheet

PIC18F66K80 FAMILY
DS39977F-page 404  2010-2012 Microchip Technology Inc.
EXAMPLE 27-3: 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.