Portable electronic device

A combined electronic timepiece and calculator, comprising;

• timing signal generation means for generating a standard frequency clock signal and a plurality of timing signals;
• timekeeping circuit means responsive to said standard frequency clock signal for computing at least the units and tens of seconds, units and tens of minutes, and units and tens of hours of current time information;
• a plurality of numeric keys for generating numeric data signals when actuated;
• encoder circuit means responsive to said timing signals from said timing signal generator for encoding said numeric data signals in time serial form to produce a serial numeric data signal;
• calculation circuit means coupled to receive said serial numeric data signal;
• externally actuatable mode selection means for generating first and second mode selection signals;
• an output selector gate coupled to receive a time information signal from said timekeeping circuit means and a calculation information signal from said calculation circuit means, and responsive to said first mode selection signal and said second mode selection signal for selectively passing said calculation information signal and said time information signal respectively;
• a clear gate coupled to receive signals passed by said output selector gate;
• a setting gate coupled to receive the output of said clear gate;
• an input selector gate responsive to said first control signal for passing the output of said setting gate to an input of said calculation circuit, and responsive to said second control signal for passing the output of said setting gate to an input of said timekeeping circuit;
• display driver circuit means coupled to the output of said setting gate, for producing display drive signals;
• an electro-optical display device responsive to said display drive signals for displaying calculation results and time information in digital form;
• a plurality of function keys for producing control signals to selectively designate said hours, minutes and seconds of time information for correction;
• circuit means for producing a ten key actuation signal each time one of said numeric keys is actuated;
• circuit means responsive to said time information correction designation signals and to said ten key actuation signal for producing a first gate control signal prior to a first actuation of a numeric key subsequent to actuation of a function key, and for producing a second gate control signal upon the first actuation of a numeric key subsequent to said actuation of a function key;
• circuit means responsive to said timing signals, said first gate control signal, said serial numeric data signal and a control signal designating the seconds of time information for correction, for applying said numeric data signal to said setting gate to set the tens of seconds of time information computed by said timekeeping circuit to a corrected value, and for applying a clear signal to said clear gate whereby the units for seconds of time information are reset to zero and thereupon commence to be incremented once per second by said timekeeping circuit, and thereafter responsive to said second gate control signal, said serial numeric data signal, said timing signals, and said control signal designating the seconds of time for correction, for applying said serial numeric data signal to said setting gate, thereby setting the units of seconds of time information computed by said time-keeping circuit to a corrected value.