Introduction
    
    Various types of instruments are required for driving the inputs and controlling the timing of microcontroller based circuits, such as interrupt generator, pattern generator, switches etc These instrumental models are incorporated and the model description, simulation procedures for those models are described below.
 
The various instrumental models are:
    1.  Interrupt
    2.  Pattern
    3.  Serial Pattern
    4.  Parallel Pattern  
    5.  Parallel Pattern with Interrupt 
 
    6.  Digital Switch 
 
    7.  LED Display 
 
    8.  Gray Code Generator  
  
    9.  Digital Clock Display 
 
    10.  Clock Display Driver
    11.  Four Digit Display
    12.  Four Digit Display Driver
    13.  Stepper Motor
    14.  Alpha Numeric Display
    15.  Liquid Crystal Display
    16.  Voltmeter
    17.  LED
All the above models are grouped under ‘Instruments’ category in the Schematic Browser.