Description

6. Connect 7447 decoder 4-pins to the first 4-pins in PORTC.

7. Use first 6-pins in PORTA as the enable/disable pins for the six 7-segments.

8. Stop Watch counting should start once the power is connected to the MCU.

9. Configure External Interrupt INT0 with falling edge. Connect a push button with the internal pull-up resistor. If a falling edge detected the Stop Watch time should be reset.

10. Configure External Interrupt INT1 with raising edge. Connect a push button with the external pull-down resistor. If a raising edge detected the Stop Watch time should be paused.

11. Configure External Interrupt INT2 with falling edge. Connect a push button with the internal pull-up resistor. If a falling edge detected the Stop Watch time should be resumed.

12. Check this video: https://youtu.be/yYCSIoMDszU

Thanks and Good Luck
Eng / Mohamed Tarek