Q8Microprocessor

The internal architecture of a microprocessor/microcontroller CPU comprises several key functional blocks: the Arithmetic Logic Unit (ALU), which performs all arithmetic (addition, subtraction) and logical (AND, OR, XOR, complement) operations on data; the Control Unit, which fetches instructions from memory, decodes them, and generates the sequence of internal control signals needed to execute each instruction, coordinating the timing and operation of all other CPU blocks; the register array, comprising general-purpose registers (used for temporary data storage during program execution) and special-purpose registers (Program Counter, tracking the address of the next instruction to fetch; Stack Pointer, tracking the top of the stack; Accumulator, the primary register for ALU operand/result storage; Flag/Status register, recording condition flags resulting from ALU operations); and internal data and address buses connecting the ALU, registers, control unit, and external memory/I/O interface, over which data and address information flows during instruction fetch and execution.