$($

a

$)$

$($

$1$

$0$

$$pts

$)$

$$Generate the machine code corresponding to the Delay and Long

$\_$

Delay

subroutines of the following AVR assembly program. Use hexadecimal numbers to

represent the resulting code FOR EACH ASSEMBLY PROGRAM LINE THAT

GENERATES A MACHINE CODE.

$($

b

$)$

$($

$5$

$$pts

$)$

$$What is the size of this program in bytes?

$($

c

$)$

$($

$5$

$$pts

$)$

$$What are the values of R

$2$

$0$

$,$

R

$2$

$1$

$,$

R

$2$

$2$

$$after the execution of Long

$\_$

Delay

subroutine?

$($

d

$)$

$($

$5$

$$pts

$)$

$$How long is the delay introduced by a single call of the following subrou

$-$

tine Long

$\_$

Delay in seconds with a

$1$

$$

$$

$$

$$clock frequency?

$($

e

$)$

$($

$5$

$$pts

$)$

$$What should be the minimum stack size to call the Long

$\_$

Delay subrou

$-$

tine?RESET :

; Stack initialization

ldi R$16,$ low $($RAMEND$)$

out SPL$,$ R$16$

ldi R$16,$ high $($RAMEND$)$

out SPH$,$ R$16$

Delay:

ldi R$20,$ $$00$

ldi R$21,$ $$01$

D$1$:

subi $R20,1$

sbci R$21,0$

brcc D$1$

ret

Long$\_$Delay :

ser R$22$

LD$1$:

rcall Delay

dec R$22$

brne LD$1$

ret