| 摘要 |
PURPOSE:To prevent a system from malfunction by previously setting up a switch connected to each system properly before turning on a main switch, then inhibiting the change of working of the like of each system after turning on the main switch. CONSTITUTION:In a microcomputer system, plural devices such as a memory an I/O device are formed as one system and these plural systems A1, A2 are connected to a power supply Vcc. One system A1 is connected to the power supply Vcc through the main switch Sm and the other system A2 is connected through a subswitch S24 of a relay Ry2. In this case, a setting switch S1 is previously turned on before turning on the main switch Sm, and when the main switch Sm is turned on, the relay Ry2 is driven through a delay circuit 3, a buffer circuit 4 and a reed switch S22 of a relay Ry1. When the switches S23, S24 are turned on, self-holding is attained and the system A2 is connected to the power supply Vcc. When the setting switch S1 is off, the connection of the system A2 with the power supply is inhibited. |
