Assume that the following changes are made in the basic computer: The hardwired control unit is replaced by the microprogrammed control unit; The size of control memory is $12820.$ There are two registers SBR and CAR available in the control unit; A microprogram can use eight consecutive memory locations in the control memory. The microinstruction is of $20$ bits and contains the following fields:

$\backslash$table$[[$F$1,$F$2,$F$3,$CD$,$BR$,$AD$],[(3$bits$),(3$bits$),(3$bits$),(2$bits$),(2$bits$),(7$bits$)$