Switchable serial addition-subtraction circuit for BCD-8421 coded decimal digits

摘要

The serial addition-subtraction circuit according to the subject of the invention differs from the serial addition-subtraction circuit according to P 3844384.8 in that the gate circuit (6) is not arranged between the circuit (5) and the shift register (4), but between the shift register (3) and the circuit (5). The number of AND circuits (35) has increased in this case from four to six. <IMAGE>