reading / resetting timer0 in 16 bit mode


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  1. #1
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    Default reading / resetting timer0 in 16 bit mode

    good day to all in this forum,
    I am using pic18f877 as a counter and I would like to use timer0 in 16 bit mode for reading an external signal.
    At the moment I am not able to read the whole 16 bit content of the timer correctly.
    Any sample picbasic code please ? / any help please ?
    Thank in advance
    regards,
    Bye

  2. #2
    Join Date
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    Default Re: reading / resetting timer0 in 16 bit mode

    I didn't know there was an PIC18F877 and I can't seem to find a datasheet for it so I would guess you're using the 16F877 but that doesn't have a 16bit TMR0 so you'd need to clarify that a bit.

    But generally speaking, you read the TMR0L first which latches the high byte of the timer/counter into TMR0H for you to read.
    Code:
    myCount VAR WORD
    
    myCount.BYTE0 = TMR0L    ' Get low byte and latch content of high byte
    myCount.BYTE1 = TMR0H   ' Get high byte
    /Henrik.

  3. #3
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    Default Re: reading / resetting timer0 in 16 bit mode

    Thanks Henrik;
    I am sorry for the PIC type: it is a PIC18F452.
    I understand that I must read the low byte first and then read the high byte.
    I must write the high byte first and then write the low byte ...
    Am I correct please ?
    Thanks
    Bye

  4. #4
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    Default Re: reading / resetting timer0 in 16 bit mode

    That is correct.

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