| 摘要 |
PURPOSE:To improve the utilizing efficiency of a memory by switching memory arrangement by causing a switching means to actuate the 1st or 2nd selecting means depending upon that whether a detecting means detects the execution of a test program or an application program. CONSTITUTION:The 1st memory arrangement is formed when changeover switches 18 and 20 are respectively connected to contacts (a) and (c) and selection circuits 13 and 14 which are the 1st selecting means are respectively connected to a system ROM 3 and application ROM 4. When a detection circuit 22 detects that a CPU 1 reads out the execution starting address of an application program, the circuit 22 respectively changes the switches 18 and 20 to contacts (b) and (d) sides. As a result, selection circuits 19 and 21 which are the 2nd selecting means are respectively connected to the system ROM 3 and application ROM 4 and the 2nd memory arrangement is formed. Therefore, efficient test program and application program execution becomes possible. |
