countdown timer using pic16f877a

Thread Starter


Joined Feb 28, 2016
can anyone help me?
im trying to build a countdown timer using the assembly language

1. 1 seven segment for the minutes and 2 seven segment for the seconds
2. the maximum time will be 9:59
3. there are 4 switches for the input. which accepts time in "minute"
ex: 5 minutes, 8 minutes..
4. a RESET button, that when pressed, the count will stop.
5. an LED will turn on when the count reaches 0:00

the circuit is attached... i appreciate your kindness!!