| 摘要 |
PURPOSE:To control an address in the start of a processor without any restriction upon software, by providing a three-bit shift register which operates with a memory read signal and a selecting circuit which selects one word among inputs to the register and by adding a simple circuit. CONSTITUTION:The microprocessor consists of microprocessor part 1, and memory 4 stored with a program controlling processor part 1. Further, three-bit capacity shift register 2 is provided which has a RESET signal terminal and performs shift operation in response to a readout timing signal from processor part 1 to memory 4. Then, an external jump instruction, a jump-destination address, and the readout output of memory 4 are applied to selecting circuit 3 via signal lines X1-X3 and X4 to select one of the jump instruction, jump-destination address and memory output according to the 1st-3rd bit outputs of register 2; and it is supplied to processor part 1 to control the address of the processor in its start. |
