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2001 Microchip Technology Inc. DS39024B-page 31
Using the MPLAB
®
C17 C Compiler
;Save BSR and WREG
movfp BSR, PCLATH
clrf BSR, 1
movpf PCLATH, save_BSR
;Service the interrupt by calling the interrupt
;handling function
goto _TMR0_2
_TMR0_1
BANKSEL fpTMR0
movfp fpTMR0+1, PCLATH
movfp fpTMR0, PCL
_TMR0_2
call _TMR0_1 ; push address of next instruction on stack
;Restore WREG and BSR
clrf BSR, 1 ;BSR was saved in bank 0
movfp save_BSR, BSR ;Now restore it
movfp save_WREG, WREG ;and WREG as well.
;Restore PCLATH and ALUSTA
movfp save_PCLATH, PCLATH
movfp save_ALUSTA, ALUSTA
;Return from interrupt
RETFIE
;-----------------------------------------------------------;
;-----------------------------------------------------------;
_T0CKI_prolog
;Save BSR and WREG
movfp BSR, PCLATH
clrf BSR, 1
movpf PCLATH, save_BSR
;Service the interrupt by calling the interrupt
;handling function
goto _T0CKI_2
_T0CKI_1
BANKSEL fpT0CKI
movfp fpT0CKI+1, PCLATH
movfp fpT0CKI, PCL
_T0CKI_2
call _T0CKI_1 ; push address of next instruction on stack
;Restore WREG and BSR
clrf BSR, 1 ;BSR was saved in bank 0
movfp save_BSR, BSR ;Now restore it
movfp save_WREG, WREG ;and WREG as well.
;Restore PCLATH and ALUSTA
movfp save_PCLATH, PCLATH
movfp save_ALUSTA, ALUSTA
;Return from interrupt
RETFIE
;-----------------------------------------------------------;