Digital electronic circuit for addition and subtraction - has separate adder and subtractor stages coupled to result register, and control circuit

摘要

The circuit is used for the addition and subtraction of numbers in 5211 code, and has a pair of input registers that are coupled to an adder circuit module (4) and a subtractor module (5). The outputs from the adder and subtractor modules are received by controlled gating stages (7,8) coupled to a results register (3). The register has an associated register (50) that handles the position of the decimal point. The control of the gates and registers is provided by signals from a control circuit.