App note: using external memory with PIC24F/24H/dsPIC33F devices

Here’s an app note from Microchip on Interfacing external memories using Parallel Master Port (PMP) module.

This application note describes the methodology to use the Parallel Master Port (PMP) module to interface with external data memory; either external Flash or external RAM. This application note also lists the APIs and describes how to implement different types of interfaces.