Digital electronic circuit for addition and subtraction of 5211 code - has registers coupled to inputs of separate adder and subtractor stages, with arithmetic operation regulated by control circuit

摘要

The circuit has input registers (1,2) that are coupled to the inputs of separate circuits for addition (4) and subtraction (5). The outputs of the registers are cross coupled back to the inputs of the registers. Outputs from the processor units are gated and combined as input to a register that generates a result in 5211 code. A control circuit generates pulses for the correction of outputs to provide a correct value output.