| 摘要 |
PURPOSE:To increase the speed of program processing by individually setting up memory reading time width in a slow access time circuit and a rapid access time circuit at the time of reading out the contents of the memory in a computer. CONSTITUTION:Plural ROM selecting signals CS0 to CSm to be applied to a ROM 9 through a power strobing circuit 11, a memory reading signal 7 and a machine clock 4 are connected to a machine clock control circuit 13. Since the ROM 9 is accessed by using the circuit 11, power supply rise time t2 + address setting-up time t3 is required until the determination of data. Therefore, the circuit 13 supplies a machine clock 14 to a CPU 3 after stopping the supply of one clock of the machine clock 4. Only at the time of accessing the ROM 9, the clock 4 in a ROM reading time T2 is divided into two clocks and the divided clock is used as a clock at the time of accessing a RAM 10, so that the memory reading time width in the program can be shortened.
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