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PIC18F258-E/LSQTP Datasheet(PDF) 206 Page - Microchip Technology

Part # PIC18F258-E/LSQTP
Description  28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
PDF  402 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F258-E/LSQTP Datasheet(HTML) 206 Page - Microchip Technology

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PIC18FXX8
DS41159E-page 204
© 2006 Microchip Technology Inc.
EXAMPLE 19-1:
WIN AND ICODE BITS USAGE IN INTERRUPT SERVICE ROUTINE TO ACCESS
TX/RX BUFFERS (CONTINUED)
RXB0Interrupt
BCF
PIR3, RXB0IF
; Clear the interrupt flag
GOTO
AccessBuffer
AccessBuffer
; This is either TX or RX interrupt
; Copy CANCON.ICODE bits to CANSTAT.WIN bits
MOVF
CANCON, W
; Clear CANCON.WIN bits before copying
; new ones.
ANDLW
b’11110001’
; Use previously saved CANCON value to
; make sure same value.
MOVWF
CANCON
; Copy masked value back to TempCANCON
MOVF
TempCANSTAT, W
; Retrieve ICODE bits
ANDLW
b’00001110’
; Use previously saved CANSTAT value
; to make sure same value.
IORWF
CANCON
; Copy ICODE bits to WIN bits.
; Copy the result to actual CANCON
; Access current buffer…
; User code
; Restore CANCON.WIN bits
MOVF
CANCON, W
; Preserve current non WIN bits
ANDLW
b’11110001’
IORWF
TempCANCON, W
; Restore original WIN bits
MOVWF
CANCON
; Do not need to restore CANSTAT - it is read-only register.
; Return from interrupt or check for another module interrupt source



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