MSP430-Digital Input

digital input using the P1.3 (pull down resistor required)
      .include "msp430g2x31.inc"

      org 0xf800                           

      mov.w #(WDTPW|WDTHOLD), &WDTCTL

      CLR.B P1OUT

      CLR R5  

      mov.b #0x41, &P1DIR 

                

L1:   MOV.b &P1IN,  r5

      AND.b #0x8,r5

      tst r5

      JZ L1

      mov.b #0x41, &P1OUT 

    

L3:   jmp L3

      org 0xfffe

      dw 0xf800