.text ; program start

.global _main ; define entry point

_main:

NOP

mov.w #WDTPW+WDTHOLD,&WDTCTL ; stop watchdog timer

;Set the I/O port that controls the RED LED to an output.

; To do this set bit 0 in the P1DIR register. Leave all

; all other I/O lines as inputs

bis.b #0000001b,&P1DIR

mov.a #1000000, R5

Mainloop:

NOP

bic.b #00000001b,&P1OUT ; clear P1.0 which will turn off

; the RED LED.

call #HalfSecondDelay

bis.b #00000001b,&P1OUT ; set P1.0 which will turn on the

; RED LED.

jmp Mainloop; jump to the Mainloop label

nop

HalfSecondDelay:

sub.a #1, R5

jnz HalfSecondDelay

ret