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PIC18F4685-I/SP Datasheet(PDF) 280 Page - Microchip Technology |
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PIC18F4685-I/SP Datasheet(HTML) 280 Page - Microchip Technology |
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280 / 484 page  PIC18F2682/2685/4682/4685 DS39761B-page 278 Preliminary © 2007 Microchip Technology Inc. EXAMPLE 23-1: CHANGING TO CONFIGURATION MODE EXAMPLE 23-2: WIN AND ICODE BITS USAGE IN INTERRUPT SERVICE ROUTINE TO ACCESS TX/RX BUFFERS ; Request Configuration mode. MOVLW B’10000000’ ; Set to Configuration Mode. MOVWF CANCON ; A request to switch to Configuration mode may not be immediately honored. ; Module will wait for CAN bus to be idle before switching to Configuration Mode. ; Request for other modes such as Loopback, Disable etc. may be honored immediately. ; It is always good practice to wait and verify before continuing. ConfigWait: MOVF CANSTAT, W ; Read current mode state. ANDLW B’10000000’ ; Interested in OPMODE bits only. TSTFSZ WREG ; Is it Configuration mode yet? BRA ConfigWait ; No. Continue to wait... ; Module is in Configuration mode now. ; Modify configuration registers as required. ; Switch back to Normal mode to be able to communicate. ; Save application required context. ; Poll interrupt flags and determine source of interrupt ; This was found to be CAN interrupt ; TempCANCON and TempCANSTAT are variables defined in Access Bank low MOVFF CANCON, TempCANCON ; Save CANCON.WIN bits ; This is required to prevent CANCON ; from corrupting CAN buffer access ; in-progress while this interrupt ; occurred MOVFF CANSTAT, TempCANSTAT ; Save CANSTAT register ; This is required to make sure that ; we use same CANSTAT value rather ; than one changed by another CAN ; interrupt. MOVF TempCANSTAT, W ; Retrieve ICODE bits ANDLW B’00001110’ ADDWF PCL, F ; Perform computed GOTO ; to corresponding interrupt cause BRA NoInterrupt ; 000 = No interrupt BRA ErrorInterrupt ; 001 = Error interrupt BRA TXB2Interrupt ; 010 = TXB2 interrupt BRA TXB1Interrupt ; 011 = TXB1 interrupt BRA TXB0Interrupt ; 100 = TXB0 interrupt BRA RXB1Interrupt ; 101 = RXB1 interrupt BRA RXB0Interrupt ; 110 = RXB0 interrupt ; 111 = Wake-up on interrupt WakeupInterrupt BCF PIR3, WAKIF ; Clear the interrupt flag ; ; User code to handle wake-up procedure ; ; ; Continue checking for other interrupt source or return from here … NoInterrupt … ; PC should never vector here. User may ; place a trap such as infinite loop or pin/port ; indication to catch this error. |
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