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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
eg. LCD or LED
(ii) Hard real time E.S
eg. Nuclear reactor CS