PULSE GENERATOR

PROBLEM TO BE SOLVED: To simplify control by equalizing the internal count values of respective LSI by adding an external synchronizing output when using plural LSI for generating various kinds of required pulses. SOLUTION: In a certain LSI, a frequency dividing ratio and a pulse position or the like are set to a microcomputer 4. The microcomputer 4 operates microcomputer frequency dividing ratio setting from this frequency dividing ratio, inputs it to a coincidence detection circuit 5 and compares it with an output value COUNT+1 of an adder 1 and when these values are equal, a low output is applied. This output is latched by a DFF 7 and further latched by a DFF 8 as the external synchronizing output, an AND RESET with an external synchronizing input through a DFF 6 is obtained by an AND gate 9 and corresponding to this value, a COUNT value is reset to '0'. In this case, since the external synchronizing output of an output from the DFF 7 is defined as the external synchronizing input of the other LSI in the same configuration, the COUNTs of these LSIs simultaneously output the equal value. Therefore, when providing a lot of pulses while using the plural LSI, the count values inside the respective LSIs are coincident and setting can be simplified.