| 摘要 |
PURPOSE:To write and read data correctly by applying to a chip selection terminal a signal obtained by AND of a memory selection signal and a synchronizing signal synchronized with machine cycles. CONSTITUTION:In a memory access circuit, the low-order digit signals of address signals outputted from a microprocessor 1 are connected to inputs of addresses 4 and 5 of an address latch type memory 3, and the high-order digit signals are inputted to a decoder which converts the high-order digit signals into corresponding memory selection signals to the memory 3; and the memory selection signals outputted by the decoder and a machine synchronizing signal outputted by the microprocessor 1 are inputted to an AND circuit, whose output is inputted to the chip selection terminal of the address latch type memory 3. |
