b$)$ The PIC$18$ microcontrollers with a modified Harvard architecture are popular in both industrial developers and hobbyists.

i$.$ Sketch and label the basic components in a microcontroller.

$[8$ Marks$]$

ii$.$ Sketch and label von Neumann architecture

$[5$ Marks$]$

iii. Sketch and label Harvard architecture.

$[5$ Marks$]$

iv$.$ List $(4)$ FOUR differences of von Neumann compared to Harvard architecture.