What is control function, Computer Engineering

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Q. What is control function?

If transfer is to take place only under a predetermined control condition then this condition can be specified as a control function. For illustration if P is a control function then P is a Boolean variable which can have a value of 0 or 1. It is terminated by a colon (:) and placed in front of actual transfer statement. Operation specified in statement occurs only when P = 1. Consider the statements:

              If (P =1) then   (R2←R1)

              Or,

              P:  R2←R1,

 

 Where P is a control function that can be either 0 or 1.


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