PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 188

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
RXB0Interrupt
AccessBuffer
DS30475A-page 188
bcf
goto
; Copy CANCON.ICODE bits to CANSTAT.WIN bits
movf
andlw
movwf
movf
andlw
iorwf
movff
; Access current buffer…
; Your code
; Restore CANCON.WIN bits
movf
andlw
iorwf
; Do not need to restore CANSTAT - it is read-only register.
; Return from interrupt or check for another module interrupt source
PIR3, RXB0IF
AccessBuffer
TempCANCON, W
b’11110001’
TempCANCON
TempCANSTAT, W
b’00001110’
TempCANCON
TempCANCON, CANCON
CANCON, W
b’11110001’
TempCANCON
Advanced Information
; Clear the interrupt flag
; This is either TX or RX interrupt
; Clear CANCON.WIN bits before copying
; new ones.
; Use previously saved CANCON value to
; make sure same value.
; Copy masked value back to TempCANCON
; Retrieve ICODE bits
; Use previously saved CANSTAT value
; to make sure same value.
; Copy ICODE bits to WIN bits.
; Copy the result to actual CANCON
; Preserve current non WIN bits
; Restore original WIN bits
2000 Microchip Technology Inc.