Digital electronic circuit for addition and subtraction of 5211 code - has tetrade circuit for addition and subtraction with selection signals generated by control circuit

摘要

The circuit has input shift registers that connect with the inputs of a processing circuit that can be switched between addition and subtraction modes. The output is gated through a register generating a result in 5211 code. The register has an associated register for the decimal point position. The control of the tetrade circuit is provided by signals generated by a circuit (10) that has a pulse counter (17) generating addition and subtraction mode pulses.