DIGITAL SIGNAL PROCESSING UNIT WITH EMULATION CIRCUITRY AND DEBUG INTERRUPT ENABLE REGISTER INDICATING SERVICEABLE TIME-CRITICAL INTERRUPTS DURING REAL-TIME EMULATION MODE

An improved microprocessor is provided having a program control unit for storing and then decoding instructions, a program address generation unit for generating addresses used to obtain instructions, an address register arithmetic unit for generating addresses for data, an arithmetic logic unit for performing operations on data, a shifter unit for shifting data in response to a predetermined instruction, a multiplier unit for performing multiplication of two input values; and a plurality of registers of which at least a portion are individually selectively associated with one or more of said units as a function of an instruction.