RegistersRegisters in the Heritage-1 CPU can be classified into three categories:
- General Purpose
- Address Oriented
- CPU specific
General Purpose registers are 16 bits and they are accessible to the applications programmer. The Accumulator (A) serves as left operand and result holder for the ALU.
Address Oriented registers are 20 bits and they serve as pointers to Main Memory or Peripherals.
CPU specific registers have different sizes and they are not directly addressable. Falling into this category are the Program Counter (CP) and the Instruction Register (IR).
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