;***** VARIABLE DEFINITIONS w_temp EQU 0x71 ; variable used for context saving status_temp EQU 0x72 ; variable used for context saving pclath_temp EQU 0x73 ; variable used for context saving
clrf PCLATH ; ensure page bits are cleared goto main ; go to beginning of program
ORG 0x004 ; interrupt vector location
movwf w_temp ; save off current W register contents movf STATUS,w ; move status register into W register movwf status_temp ; save off contents of STATUS register movf PCLATH,w ; move pclath register into w register movwf pclath_temp ; save off contents of PCLATH register
; isr code can go here or be located as a call subroutine elsewhere
movf pclath_temp,w ; retrieve copy of PCLATH register movwf PCLATH ; restore pre-isr PCLATH register contents movf status_temp,w ; retrieve copy of STATUS register movwf STATUS ; restore pre-isr STATUS register contents swapf w_temp,f swapf w_temp,w ; restore pre-isr W register contents retfie ; return from interrupt
w_temp EQU 0x71 ; variable used for context saving status_temp EQU 0x72 ; variable used for context saving pclath_temp EQU 0x73 ; variable used for context
w_temp EQU 0x71 ; variable used for context saving status_temp EQU 0x72 ; variable used for context saving pclath_temp EQU 0x73 ; variable used for context
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