RTOS sets the rules during the execution of application
program.
and It is responsible for managing the different hardware resources of Embedded system

we can classify embedded systems as real time, stand alone, networked, mobile based on

we can classify embedded systems as small, medium, sophisticated scale based on

Infrequent deadline misses are acceptable, but may degrade the
system’s quality of service

Can miss some deadlines, but eventually performance will degrade
if too many are missed, such as sound system in your computer

Must absolutely hit every deadline, such as nuclear, some medical
and defense applications

takes the input
from the input ports either analog or digital and
processes, calculates and converts the data and gives the resulting data through the connected devices

are related to a network to
access the resources

are used in portable embedded
devices

cell phones, mobiles, digital cameras, mp3
players and personal digital assistants are examples of

This type of embedded system is the fastest growing area in
embedded system applications

digital cameras, microwave ovens and
temperature measurement systems are examples of

are designed with a single
8 or 16–bit microcontroller, that may even be activated by
a battery

have enormous
hardware and software complexities, that may need
IPs or configurable processors.

are designed with a
single or 16 or 32 bit microcontroller. These types of
embedded systems have both hardware & software complexities.

Advantages of embedded systems ..

Disadvantage of embedded systems

..................... are inside another device used for running one predetermined application or collection of software.

..................... designed for use by an individual, usually incorporating a graphics display, keyboard, and mouse

..................... used for running larger programs for multiple users or programs that require continuous online access. They are typically accessed only via a network

..................... a class of computers with the highest performance and cost. They are configured as servers and typically cost millions of dollars