CIRCUIT FOR GENERATING CONTROL SIGNAL

PURPOSE:To output the control signals of difference modes by checking whether on not the synchronism is secured between a timing generating circuit which works with a 1st clock and another timing generating circuit which works with a 2nd clock. CONSTITUTION:A 1st timing generating circuit 1 works with the 1st clock and a 2nd timing generating circuit works with the 2nd clock respectively. Both circuits 1 and 2 are started by a single start signal and output a series of timing signals respectively. A detecting means 3 checks whether or not the synchronism is secured among those timing signals. Based on this detection signal, a control signal generating means 4 produces the control signal of a 1st mode and the control signal of a 2nd mode when the synchronism is secured and not among said timing signals respectively.