16F877A timer to capture in microseconds


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  1. #4
    Join Date
    Dec 2007
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    Malaysia
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    Method 1 is sufficient to complete my project, as it is possible to capture display the time in milliseconds.

    I am facing a problem here of which, I do not know how to calculate the require timer pre-load value in order for to timer to count on 1 millisecond basis. I tried to apply the value $FC38 which I calculated based on my understanding from $D910 as in the sample codes, but it appears to that the timer counts become slower. I tried with other values such as $FFFE, $03C7, all seems to make the timer count really slow.

    Can anyone guide/teach me in how to calculate the actual pre-load value which I can get 1 millisecond timer and display it on LCD? I am using 16F877A with 4Mhz crystal.

    Sorry for all the question, I am really new to this, hope can help me. Very much thanks.
    Last edited by sycluap; - 19th December 2007 at 06:42.

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