| 摘要 |
PURPOSE:To determine the calendar information rapidly under simple control by simultaneously calculating the conversion from month data to day data and the month last day data according to predetermined processing. CONSTITUTION:Year, month data are loaded from a key input unit to a ROM address unit. A program is read through the ROM to store the year and month responsive to the key inputs in shift registers 18, 21. Then, day data per one day is applied to the register 21 by operating the calendar key at the key input unit. An adder 29 calculates the standard year and month data to convert the data in the register 18 to standard year and month data, and also calculates predetermined number to be added to the flag bits of the shift registers 19, 18 on the basis of the month data thus converted to discriminate the progress of the month according to the existence of the carry signal at the minimum significant bit of the adder 29 to add the number of days in every month through the shift register 20 at the time corresponding to the number of the converted months to the standard value to thereby simultaneously count the number of days and discriminate the end of the month so as to rapidly indicate the calendar indication. |
