PURPOSE: To prevent the unexpected defect of fetching data by re-outputting the data whose output is previously interrupted, when a low power consumption mode is reset to a normal operating mode, and the data from a data inputting device can be inputted.
CONSTITUTION: This device is equipped with a D-type flip flop 6 being an output inhibiting means, and a buffer 7 which operates the wired OR of an output control signal (b) outputted by a keyboard controller 4, with an output inhibiting signal (e) outputted by the D-type flip flop 6. Then, when the keyboard controller 4 resets from the low power consumption mode to the normal operating mode by a data input start from a keyboard 2, a keyboard microcomputer 8 is allowed to re-output the initial data. Therefore, when the absence of the data output from the keyboard microcomputer 8 in a prescribed time is detected, or when the data are not outputted by the keyboard microcomputer 8 by a command through an interface signal (a) from a main CPU 3 or the like, the keyboard controller 4 can be in the low power consumption mode.
IKEGAMI YASUO
NOMURA YOSHIAKI
HITACHI VIDEO & INF SYST