DSPIC30F(2005) Datasheet PDF - Microchip Technology

Introduction
The dsPIC30F CPU module has a 16-bit (data) modified Harvard architecture with an enhanced instruction set, including significant support for DSP. The CPU has a 24-bit instruction word, with a variable length opcode field. The program counter (PC) is 24-bits wide and addresses up to 4M x 24 bits of user program memory space. A single cycle instruction pre-fetch mechanism is used to help maintain throughput and provides predictable execution. All instructions execute in a single cycle, with the exception of instructions that change the program flow, the double-word move (MOV.D) instruction and the table instructions. Overhead free program loop constructs are supported using the DO and REPEAT instructions, both of which are interruptible at any point.