Patent ID: 8269655

Claim:
A key control circuit controlling a key matrix circuit in which keys are arranged in a plurality of rows and columns, comprising: a key selecting means making the keys disabling or enabling by either line of the rows or the columns on the key matrix circuit being used as a unit; and a control means, when key selection is performed by the key selecting means, detecting a press of an enabled key, keeping key pressing detection in a standby status for a predetermined time from a time point of the press of the enabled key, and resuming the key pressing detection after passage of the predetermined time to check a press of an enabled key to which a function is assigned, wherein the control means starts the function which is assigned, if the enabled key to which the function is assigned is pressed, and the control means keeps the key pressing detection in the standby status, if the enabled key to which the function is assigned is not pressed and a press of an enabled key to which the function is not assigned is not released.