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Types of embedded systems
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1. Based on level of complexity

(i) Small scale :

  • Limited or simple hardware interface

  • single running application

  • low complexity

  • no RTOS

eg. DC motor controller

(ii) Medium scale :

  • Moderate no. of hardware interface

  • simple primary application with multiple procedure/ISR

  • Medium complexity

  • No RTOS

eg. Digital clock

(iii) Sophisticated :

  • High level or large number of hardware interface

  • Fully multitasked

  • High complexity

  • RTOS

eg. Smartphones

2. Based on Time response :

System specific/finite time response and time deadlines are called as Real time embedded systems.

(i) Soft real-time E.S

  • Deadlines are met statistically

eg. LCD or LED

(ii) Hard real time E.S

  • Deadlines are met hard on each and every instance

eg. Nuclear reactor CS

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