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PIC18F4685-I/SP Datasheet(PDF) 281 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) 281 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
Preliminary
DS39761B-page 279
PIC18F2682/2685/4682/4685
EXAMPLE 23-2:
WIN AND ICODE BITS USAGE IN INTERRUPT SERVICE ROUTINE TO ACCESS
TX/RX BUFFERS (CONTINUED)
ErrorInterrupt
BCF
PIR3, ERRIF
; Clear the interrupt flag
…
; Handle error.
RETFIE
TXB2Interrupt
BCF
PIR3, TXB2IF
; Clear the interrupt flag
GOTO
AccessBuffer
TXB1Interrupt
BCF
PIR3, TXB1IF
; Clear the interrupt flag
GOTO
AccessBuffer
TXB0Interrupt
BCF
PIR3, TXB0IF
; Clear the interrupt flag
GOTO
AccessBuffer
RXB1Interrupt
BCF
PIR3, RXB1IF
; Clear the interrupt flag
GOTO
Accessbuffer
RXB0Interrupt
BCF
PIR3, RXB0IF
; Clear the interrupt flag
GOTO
AccessBuffer
AccessBuffer
; This is either TX or RX interrupt
; Copy CANSTAT.ICODE bits to CANCON.WIN bits
MOVF
TempCANCON, W
; Clear CANCON.WIN bits before copying
; new ones.
ANDLW
B’11110001’
; Use previously saved CANCON value to
; make sure same value.
MOVWF
TempCANCON
; 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
TempCANCON
; Copy ICODE bits to WIN bits.
MOVFF
TempCANCON, CANCON
; 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
; Restore original WIN bits
; 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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