| 摘要 |
PURPOSE:To prevent miscontrol even in case wrong data is written on a control address due to a program fault, etc., by providing a selection address deciding circuit, a selection address setting circuit and a selection latch circuit. CONSTITUTION:A control address deciding circuit B decides coincidence between a control address signal 2 and the control address value 4 and latches a control data signal 3 by a control latch circuit C when a control address coincidence signal 5 is significant. Then a selection address deciding circuit B' decides coincidence between a selection address signal 2' and the selection address value 4' given from a selection address setting circuit D'. Then a selection data signal 3' is latched by a selection latch circuit C' when a selection address coincidence signal 5' is significant. Thus AND circuits I1-I8 for control clocks are opened by selection output signals 91-98 given from the circuit C'. Then control output signals 81-88 are applied to relays G1-G8. Thus it is possible to prevent miscontrol due to a program fault.
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