| 摘要 |
<p>PURPOSE:To control a power supply in a simple way by providing a flag register to a power supply control circuit to inform the propriety for break of the power supply through a program. CONSTITUTION:A central processing unit 1, a main storage device 2 and a flag register 3 are connected with each other via a common bus 7. Then the ON/OFF control is carried out to a power supply 6 by means of power supply switch 4 via a power supply control circuit 5. The write control of the register 3 is possible through the unit 1 in accordance with an instruction of the program of the storage device 2. Then the register 3 is read by an instruction of the circuit 5. Thus the information showing the ON/OFF state of the switch 4 as well as the store information on the register 3 are used as the control information on the circuit 5. Thus the circuit 5 performs the ON/OFF control of the power supply 6 in accordance with both information.</p> |
