Question

Please write an interrupt code for dspic33ep512mu810 microprocessor in Assembly Language.

Please answer if you properly know that. Will rate accordingly.

Answer 1

;******************************************************************************
; Processor
;******************************************************************************

        .equ __33EP512MU810, 1
        .include "p33EP512MU810.inc"

;..............................................................................
;Configuration bits:
;..............................................................................

        config __FOSCSEL, FNOSC_PRI & IESO_OFF

        config __FOSC, FCKSM_CSDCMD & OSCIOFNC_OFF & POSCMD_XT

        config __FWDT, FWDTEN_OFF & PLLKEN_OFF

        config __FPOR, BOREN_ON & FPWRT_PWR16

        config __FICD, ICS_PGD2

;Uninitialized variables in Near data memory (Lower 8Kb of RAM)
;..............................................................................

          .section .nbss, bss, near
Lf:          .space 2               ;variables
X:           .space 2

         .global __reset          ;The label for the first line of code.
         .global __T1Interrupt    ;Declare Timer 1 ISR name global

;..............................................................................
;Code Section in Program Memory
;..............................................................................
.text
__reset:

            MOV #0xFFFF, W0
            MOV W0,X
            MOV #0xFFFF, W0
            MOV W0, Lf
           BCLR TRISG, #TRISG8
           CLR T1CON
            CLR TMR1
            MOV #0x0005, W0
            MOV W0, PR1
            MOV #0x8030, W0
            MOV W0, T1CON
            BCLR IFS0, #T1IF
            BSET IEC0, #T1IE                            ; Enable Timer1 interrupt
START:
            COM Lf
            BTSC X,#0
            GOTO LOOP1
            GOTO LOOP2

LOOP1:
            BSET LATG, #LATG8
            COM X
            GOTO LOOP3

LOOP2:
            BCLR LATG, #LATG8
            COM X
            GOTO LOOP3

LOOP3:
            BTSC Lf,#0
            GOTO START
            BRA LOOP3

;..............................................................................
;Timer 1 Interrupt Service Routine
;..............................................................................

__T1Interrupt:

            BCLR IFS0, #T1IF
            COM Lf
            RETFIE

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