Calculator with Assembly - PIC16F877

Detailed specifications of the program

Output
The result will be shown on the 7 segment display after entering number 1, number 2 and the operation.

Input

The input is taking from the keypad matrix based on PORTB by pressing on

1	2	3
4	5	6
7	8	9
*	0	#

Note:

• You have to input 1st number then 2nd number then the operation
• To input a number you have to enter it digit by digit then press #
• Operations:
• 1 represent sum ( + )
• 2 represent subtract ( - )
• 3 represent multiply ( * )
• 4 represent divide ( / )

Program starts to enter number 1, when you hit "1" on the keypad now number 1 have "1".

Now hit "6" and number 1 will be "16"

To end editing in number 1 hit "#" and it will appear on the screen.

Now you have to enter number 2, hit "2" so number 2 is equal to "2".
Hit "#" to end editing and it will appear on the screen.

Now you have to enter the operation, hit "1" to sum the 2 numbers.

Now you have to enter the operation, hit "2" to subtract the 2 numbers.

Now you have to enter the operation, hit "3" to multiply the 2 numbers.

Now you have to enter the operation, hit "4" to divide the 2 numbers.

Program Properties

List of the used resources

•  Laptop with windows platform.
•  MPLAB X IDE v1.70 for developing.
• PIC Simulator IDE for simulating PIC16F877 microcontroller.
• Keypad Matrix
• 7 Segment Display
• PIC C Language.

Keypad Matrix configuration

7 Segment Display configuration

Download Code here.