Program Counter (PC) finished

Posted onAuthorgerard

Program Counter (PC) finished

Today, I built the program counter (PC) for my 8 bit computer. It has three control signals:

  • CE – Count Enable
  • PCO – PC Out (put the contents of the PC on the bus)
  • PCI – PC In (Read the contents of the bus and store it in the program counter – facilitates JMP instructions)

 

Here it is, the green LEDs indicate the address. It counts from 0 to 255 and can address the full 256 bytes of memory.