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Need Help Programming a Timer 16f887

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rkond2

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I am writing a program that will use the 16f887 microcontroller and use it to run a timer that would count down from 60 (or more) seconds to 0. It must be put on the LCD Display as: XX:YZ. Where XX is seconds, Y is 1/10 second and Z is 1/100 of a second. I have my initializing of T1CON - 0x30 (pre-scale 1:8), TMR1IF = 0, TMR1IE = 1, and TMR1ON = 1.

I am not really sure on the interrupt function, but I believe that is what. I need to do. Any help, advice, etc?
 

Rkond2, please use google for search, this example is very simple,
you may found very usefull info for your project on www.mikroe.com,
regards
 

An overflow interrupt would do the job but a 16-bit timer is not enough to count up to 1 sec even with the prescaler for xtal frequencies in the MHz range. So you may decrease the frequency or use a countdown variable in the ISR to time 1 sec then minute then hour etc... For example if your timer overflows at every 25ms then a countdown of 40 will time exactly 1 sec.
 

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