The result is known as a horizontal microinstruction, an example of which is
shown in Figure 16.1a.The format of the microinstruction or control word is as follows.
There is one bit for each internal processor control line and one bit for each
system bus control line. There is a condition field indicating the condition under
which there should be a branch, and there is a field with the address of the microinstruction
to be executed next when a branch is taken. Such a microinstruction is interpreted
as follows