| 摘要 |
PURPOSE:To reduce power consumption by preventing unnecessary key inputting, by suppying key sampling KS signals corresponding to only keys required according to specified modes. CONSTITUTION:In a small-size electronic computer equipped with a timer function, when a computation mode is specified with a computation mode key AC, a computation mode specifying input is read in a buffer 11 with the timing when a signal KC1 from a KS decoder 7 is outputted and then written in an RAM3 via an arithmetic part 4. The contents of data in the RAM3 are judged by a microprogram from an ROM1 according to the contents of a counter 6 to perform arithmetic processing by keying operation. When a time display mode key TM is operated, a signal INS indicating the time display mode is sent from the ROM1 to an instruction decoder 5, which outputs a sampling selection signal S2 to reset an FF10, so that since key input processing is performed even with ten keys, function keys, etc., no electric power is consumed. |
