Microprogrammed Control                                                                                                                        Print this page
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Control sequence for Conditional Branch instruction (BRN) Branch on negative)

Steps

Actions
1.
 PCout,  MARin, Read,  Clear Y,  Set Carry-in to ALU,  Add ,  Zin
2.
 Zout,  PCin,  Wait for MFC
3.
  MDRout,  IRin
4.
  PCout,  Yin
5.
  Address field-of IRout,  Add,  Zin
6.
  Zout,  PCin
7.
  End

First consider the control signal required for fetch instruction , which is same for all the instruction, we are listing them in a particular order.

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