fig6 is a circuit diagram showing a configuration example of the input circuit 35 with level shift function shown in fig5 in fig6 numeral 38 denotes an inverter which is given the emulator power supply vcca as an operation power supply 37 an inverter which is given the external power supply vcc as an operation power supply 38 an inverter which is given the external power supply vcc as an operation power supply 39 a clocked inverter which is given the external power supply vcc as an operation power supply 40 an input signal hereinafter called the 34 input circuit input signal 34 to the input circuit 35 with level shift function and 41 an output signal hereinafter called the 34 input circuit output signal 34 from the input circuit 35 with level shift function respectively the input circuit input signal 40 is connected to the data bus 7 the address bus 8 and the control signal bus 9 shown in fig5 while the input circuit output signal 41 is connected to the internal circuit bus 10 shown in fig5 a control signal of the clocked inverter 39 is a signal supplied from the internal circuit bus 10 shown in fig5 and the clocked inverter 39 receives the input signal only when signal input is permitted next explanation will be made on the operation of the input circuit 35 with level shift function when signal input to the clocked inverter 39 is permitted the input circuit input.