$.$include $"$m$128$def.inc"

$.$equ F$\_$CPU $=16000000$

$.$equ PRESCALER $=1024$

$.$equ COMPARE$\_$MATCH $=($F$\_$CPU $/(2*$ PRESCALER $*1))-1$ ; $0\mathrm{.}5$ seconds period

init:

sbi DDRB$,$ DDB$6$ ; Set Port B Pin $6$ as output

cbi DDRC$,$ DDC$6$ ; Set Port C Pin $6$ as input

ldi r$16,0$xFF

out DDRD$,$ r$16$ ; Set Port D as output

ldi r$16,(1<<$ WGM$32)$ ; Configure Timer $3$ in CTC mode

out TCCR$3$A$,$ r$16$ ; Set WGM$32$ in TCCR$3$A

ldi r$16,(1<<$ CS$32)|(1<<$ CS$30)$ ; Start Timer $3$ with prescaler $1024$

out TCCR$3$B$,$ r$16$

ldi r$16,$ low$($COMPARE$\_$MATCH$)$

out OCR$3$AH$,$ r$16$ ; Set compare match low byte

ldi r$16,$ high$($COMPARE$\_$MATCH$)$

out OCR$3$AL$,$ r$16$ ; Set compare match high byte

ldi r$16,(1<<$ OCIE$3$A$)$ ; Enable Timer $3$ compare match interrupt

out TIMSK, r$16$

sei ; Enable global interrupts

main$\_$loop:

sbic PINC, PINC$6$ ; Check if Port C Pin $6$ is HIGH

rjmp clear$\_$port$\_$d

rjmp main$\_$loop

clear$\_$port$\_$d:

ldi r$16,0$x$00$

out PORTD, r$16$ ; Clear Port D

rjmp main$\_$loop

; Timer $3$ compare match interrupt service routine

ISR$($TIMER$3\_$COMPA$\_$vect$)$:

sbi PINB, PINB$6$ ; Toggle Port B Pin $6$

reti

In line $39,$ syntax error, unexpected and ISR: Unknown instruction or macro errors occurs. Can you fix them?