https://www.youtube.com/watch?v=8AqTyjm7brA

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https://www.twenty19.com/internships/company/mint-n-pint-technologies/ux-ui-hacker
https://www.twenty19.com/internships/company/mint-n-pint-technologies/ux-ui-hacker

https://www.twenty19.com/internships/company/dexter-industries/engineering-internships
https://www.twenty19.com/internships/company/mint-n-pint-technologies/ux-ui-hacker
https://www.twenty19.com/internships/company/mint-n-pint-technologies/ux-ui-hacker

https://books.google.co.in/books?id=Tg45laRGgv8C&pg=PA3&dq=arduino+programing+architecture&hl=en&sa=X&ei=A7k7U6nQM4i3rAfAwYHQDA&ved=0CE4Q6AEwBA#v=onepage&q=arduino%20programing%20architecture&f=false

In computing, a device driver (commonly referred to as simply a driver) is a computer program that operates or controls a particular type of device that is attached to a computer.[1] A driver provides a software interface to hardware devices, enabling operating systems and other computer programs to access hardware functions without needing to know precise details of the hardware being used.

A driver typically communicates with the device through the computer bus or communications subsystem to which the hardware connects. When a calling program invokes a routine in the driver, the driver issues commands to the device. Once the device sends data back to the driver, the driver may invoke routines in the original calling program. Drivers are hardware-dependent and operating-system-specific. They usually provide the interrupt handling required for any necessary asynchronous time-dependent hardware interface.

moreover, since arduino uses highlevel programming environment ie., Arduino IDE, there is no need to learn the internal architecture of the microcontroller in detail.
sice we peovided all the stuff regarding the internal architecture of atmega8 microcontroller, have a look on that!!

check out the datasheet at this page

https://www.atmel.com/images/atmel-2486-8-bit-avr-microcontroller-atmega8_l_datasheet.pdf

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