Program for count down timer using 8051?

Question

i'm doing a project using count down timer.
it should count down from 90 to 0
i want to display the count value using a seven segment display
please anyone know this program help me
very very urgent.......

Answer 1

just set up a timer interrupt, and decrement a counter each time you go into it, then write it out to the display. I cant give more details because I dont know what language you are using or if you have a display driver chip. I assume you are using 2 7-segment displays... To slow down the countdown you may need to add some counters to the interrupt, and when it reaches a certain count, then decrement your counter.