THREE-WIRE TYPE INTERFACE CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a three-wire type interface circuit which excels in preventing the malfunctions in a runaway state of a CPU. SOLUTION: This interface circuit 2 secures an interface between a CPU 1 and a circuit 3 which is controlled by the CPU 1, Then a deciding means is added to the circuit 2 to send the data of the CPU 1 to the circuit 3 only in a correct format and sends no data to the circuit 3 in the incorrect formats together with a means which decides the abnormality of the CPU 1 in an incorrect format and generate a signal to control the CPU 1.