| 摘要 |
PURPOSE:To exclude the complicated interruption inhibition system, reservation system, etc. and to simplify an exclusive control of resources, by adding a circuit which can perform simultaneously both a check of the using state and a using declaration of resources. CONSTITUTION:A central controller 100 and an exclusive control circuit 300 of a multi- task processor system are connected to each other via a data bus 210, an address bus 220, a read indicating connection 230 and a write indicating connection 240 respectively. The signals of the bus 220 and connections 230 and 240 are supplied to an address decoder circuit 310 of the circuit 300 to decide whether the address information shows the circuit 300. When the address information shows the circuit 300, the information is transmitted to an RAM circuit 320 and an AND circuit 340. Then the data value indicated by an address is transmitted to an output data converting circuit 330 from the circuit 320, and then the data value is changed to the contents of an RAM input connection 311. While a logic is secured by the circuit 340 between the output of the circuit 310 and the connection 230, and the result of this logic is applied to the circuit 330. Then both a check of the using state and a using declaration are performed at a time to realize an exclusive control. |
