Control bus

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Key points

  • The control bus is a set of discrete lines that all indicate what more the processor is working in.
  • The read line on the control bus is set when a read operation is to be carried out
  • The write line on the control bus is set when a read operation is to be carried out
  • The clock line is switched on and off to provide a synchronising pulse for the processor to use when coordinating the movement of data
  • The interrupt line is used to change the state of the processor by replacing all the values in its registers (this is how programs can be switched)
  • The non-maskable interrupt line is used to change the state of the processor even when another program wishes to use the processor
  • The reset line zeroes all data in the processor and buses

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