Create Timers&Interrupts.md

T&I.md

@@ -0,0 +1,27 @@
+# Timers and Interrupts
+In this guide we will board **Timers** and **Interrupts**, what are they and how they are used.
+
+## Timers
+
+Timers are simple counters at some frequency, they are used to keep a record of time for different events occurring and are usually an 8-bit register (Figure (b)
+that can count the number of digital pulses applied to its input, whose values start from 0 and 
+goes all up to 255, and when it reaches its maximum it returns to 0 and repeats the process 
+all over again, unless an interrupt is used.
+
+
+![Timers](https://user-images.githubusercontent.com/70351137/136104394-70303848-497d-470b-a02d-509f4138139a.png)
+
+- In Figure (a), each stage outputs one pulse for every two pulses which are input, 
+so the output pulse frequency is half the input frequency for each stage. Therefore the timer can 
+be viewed as a binary counter of frequency divider, depending on the application.
+
+
+## Interrupts
+
+Interrupts cause a break in a continuing process which are generated by an internal or external asynchronous 
+event and the interrupt signal can be received at any time during the execution of the mein process. When this 
+happens the processor stops, handles the interrupt and then it resumes to its normal work, this is also called 
+‘interrupt service routine (ISR). 
+- For example, when you press a key from your keyboard or move the mouse on a PC, 
+an interrupt signal is sent to the processor from the keyboard interface to request that the key be read in, or 
+the mouse movement transferred to the screen.

Timers&Interrupts.md

@@ -0,0 +1 @@
+#Timers and Interrupts