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PIC18F4685-I/SP Datasheet(PDF) 289 Page - Microchip Technology

Part # PIC18F4685-I/SP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
PDF  484 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4685-I/SP Datasheet(HTML) 289 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
Preliminary
DS39761B-page 287
PIC18F2682/2685/4682/4685
EXAMPLE 23-4:
TRANSMITTING A CAN MESSAGE USING WIN BITS
; 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.
Use WIN bits to map it to RXB0 area.
MOVF
CANCON, W
; WIN bits are in lower 4 bits only.
Read CANCON
; register to preserve all other bits.
If operation
; mode is already known, there is no need to preserve
; other bits.
ANDLW
B’11110000’
; Clear WIN bits.
IORLW
B’00001000’
; Select Transmit Buffer 0
MOVWF
CANCON
; Apply the changes.
; Now TXB0 is mapped in place of RXB0.
All future access to RXB0 registers will actually
; yield TXB0 register values.
; Load transmit data into TXB0 buffer.
MOVLW
MY_DATA_BYTE1
; Load first data byte into buffer
MOVWF
RXB0D0
; Access TXB0D0 via RXB0D0 address.
; Load rest of the data bytes - up to 8 bytes into “TXB0” buffer using RXB0 registers.
...
; Load message identifier
MOVLW
60H
; Load SID2:SID0, EXIDE = 0
MOVWF
RXB0SIDL
MOVLW
24H
; Load SID10:SID3
MOVWF
RXB0SIDH
; No need to load RXB0EIDL:RXB0EIDH, 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
RXB0CON
; If required, wait for message to get transmitted
BTFSC
RXB0CON, TXREQ
; Is it transmitted?
BRA
$-2
; No.
Continue to wait...
; Message is transmitted.
; If required, reset the WIN bits to default state.



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