Timer and counting device

----- device used as a system clock

• Software timer

• Hardware timer

• Real time clock

In control bit which is used to activate the timer----

• Timer start

• Timer stop

• Timer enable

----bit is used when the timer overflow to another device

• Down count enable

• up count enable

• Time out enable

----- flag and signal set when the timer all bits reach to 0

• carry flag

• status flag

• sign flag

----- are used as virtual timing device

• hardware timer

• watchdog timer

• software timer

----- is to decrement on a clock input

• up count enable

• down count enable

• Load enable

------ is a device that counts the input for event that occur at regular or irregular intervals

• timer

• counter

• real time clock

---- is a timing device that can be set for a preset time interval

• real time clock

• watchdog timer

• incircuit emulator

Example of watchdog timer-----

• temperature controller

• mobile phone

• both

----- stopped after a preset time interval or timeout

• Finished state

• Reset state

• Initial load state