a$)$ Given the circuit, explain how DDRL should be initialised.

$(2$ marks$]$

b$)$

Assume DDRL has been initialised correctly, write the code to: i$)$

Turn ON LEDO and LED$2$ only.

Turn OFF LED$1$ and LED$3$ only.

$[3$ marks$]$

$[3$ marks$]$

ii$)$ Turn OFF all LEDs at the beginning, check the switch and:

$$ Create a blinking LED at pin PL$5($LED$3)$ every $100$ms when the switch is open.

$$ Turn on LED$1,$ delay $150$ms then turn on LED when the switch is closed.

Explain your code.

$[8$ marks$]$

c$)$

Assume DDRL has been initialised correctly, fill in the blank space $"..."$ in the following program to produce a $2$ Hz$,40\%$ duty cycle signal on LEDO:

int

main$($void

DORL $=$

$904$I

However you initialised it above

PORTLI

$=0$x$30$;

PORTL &$=0$xF$9$; while $(1)$

$$ PORTL $|=$

$---$ S

delay ms $(..$

$$D:

PORTL $8=$

deaay ms$..\mathrm{.}3$

Explain your code.