Quiz Çalışma 1 P1 interrupt

#include  "msp430g2231.h"
;-------------------------------------------------------------------------------
            ORG     0F800h                  ; Program Reset
;-------------------------------------------------------------------------------
RESET       mov.w   #0280h,SP               ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT

SetupPx     bis.b   #01h,&P1DIR            ; P1.0 output
            bic.b   #01h,&P1OUT            ; P1.0 output

            bis.b   #018h,&P1IE             ; P1.4 Interrupt enabled
            bis.b   #018h,&P1IES            ; P1.4 hi/low edge
            bic.b   #018h,&P1IFG            ; P1.4 IFG Cleared

                                            ;
Mainloop    bis.w   #LPM4+GIE,SR            ; LPM4, enable interrupts
            nop                             ; Required only for debugger

tgl         xor.b   #01h,&P1OUT
wait        mov     #5000h,R4
dd          dec     R4
            jnz     dd
            jmp     tgl

P1_ISR      and.b   #010h,&P1IFG
            jnz     off
            bic.w   #LPM4,0(SP)
            reti
off         bic.b   #010h,&P1IFG           ; P1.4 IFG Cleared
            bic.b   #01h,&P1OUT            ; P1.0 output
            mov.w   #Mainloop,2(SP)
            reti                            ; Return from ISR



            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ;
            ORG     0FFE4h                  ; P1.x Vector
            DW      P1_ISR                  ;
            END