The invention is directed towards a processing apparatus for a portable communication device. The apparatus includes: a central processing unit, first and second digital signal processing units, a first dual port memory unit adapted to store data shared between the central processing unit and the first digital signal processing unit, and a second dual port memory unit adapted to store data shared between the central processing unit and the second digital signal processing unit. The first dual port memory unit is adapted to store data shared between the first and second digital signal processing units without using the central processing unit.