| 摘要 |
PURPOSE:To obtain a program counter made of a high density integrated circuit, by constituting the program counter with a register and a ROM. CONSTITUTION:The program counter of a stored program control processor is constituted with a register RG and a ROM; and in case that the output of the register RG is used as an address of the ROM, the address generated including a discriminating bit which indicating whether conditions are satisfied or not is inputted to the ROM, and the output of the ROM is inputted to the register RG. An 8-bit tristate driver TDV is used when the branch destination of a program is stored in a RAM, a stack, or the like. A data bus DTB is connected. If the branch address is written in data when the address of the jump destination is read in respect to the ROM, the operation control becomes easy. Thus, the counter where multibit integration is difficult conventionally is made of integrated circuit using multiple bits. |
