(Atmega 16) 7 segment

Let us have the presentation first

Now we have 8 7-segment display.
How many microcontroller pins are required to interface it.
You might me thinking it would be 8x7=56. Microcontroller don't even have that many I/O.
So we would go ahead for multiplexing which would utilize just 16 I/O lines

Refer to schematic below

Now i have 2 codes for this that explain different cases when you work on it

You can see all compiler details on page Atmel AVR page 


You can download the codes from 
1) here
2) here

(PIC16F877A) 7 Segment

Let us have the presentation first

Now we have 8 7-segment display.
How many microcontroller pins are required to interface it.
You might me thinking it would be 8x7=56. Microcontroller don't even have that many I/O.
So we would go ahead for multiplexing which would utilize just 16 I/O lines

Refer to schematic below

Now i have 2 codes for this that explain different cases when you work on it 

You can find specific details of compiler and controller on the page Microchip PIC

You can down load code from here 

1) here

2) here