| 摘要 |
PURPOSE:To judge the day of the week in a simple operation circuit, by correcting the 3-bit code for judging the day of the week corresponding to the year, month, and date by means of an adder in the scale-of-7 notation. CONSTITUTION:According to the year and month countings of a year counter 11 and a month counter 12 etc., a month judging code converter 18 connected to a year judging code converter 16 and a leap year judging device 17 generates a 3-bit code corresponding to the day deviation with respect to the reference of the specified year, month and date. Similarly, a 3-bit code corresponding to the day deviation is outputted from a month counter 13 and a judging code adder 19, and added in judging code adders 20 .... These addres 20 ... perform addition, taking the shift-up carry from the highest digit as the lowest digit carry, and the sum of codes is subjected to a scale-of-7 correction, thereby outputting a 3-bit code corresponding to the judged day of the week. Therefore, the day of the week may be judged in a simple operation circuit, so that the day of the disired year, month, and date may be set. |
