instruction set architecture (DSP) (ISA)
The instruction set architecture( ISA) is part of the processor.
It refers to the assembly language and how the programmer sees the behavior of the processor. The Instruction Set Architecture serves as a demarcation between the software and the hardware.
The instruction set architecture is characterized by certain features. These include the instruction set, and the processing and storage of operands, the bit width supported by the ISA architecture, the number of registers, the addressing and the handling at interrupts.