StopTimer

Syntax:

    StopTimer TimerNo

Command Availability:

Available on all microcontrollers with a Timer modules.

Explanation:

On the Microchip PIC 18(L)Fxxx microcontrollers Timer 0 can be stopped with StopTimer.
With respect to Timer 0 on the Microchip PIC baseline and mid-range microcontrollers, StopTimer (and StartTimer) has no effect on Timer 0.




Example:

This example will measure that time that a switch is depressed (or on) and will write the results to the EEPROM.
The example shows how to stop a timer when not in use. 

    #chip 16F819, 20
    #define SWITCH PORTA.0

    Dir SWITCH In
    DataCount = 0

    'Initilise Timer 1
    InitTimer1 Osc, PS1_8

    Dim TimerValue As Word

    Do
        ClearTimer 1
        Wait Until SWITCH = On
        StartTimer 1
        Wait Until SWITCH = Off
        StopTimer 1          ' <<< the StopTimer instruction
        'Read the timer
        TimerValue = Timer1

        'Log the timer value
        EPWrite(DataCount, TimerValue_H)
        EPWrite(DataCount + 1, TimerValue)
        DataCount += 2
    Loop

Key line: StopTimer 1 — freezes Timer 1’s count the moment the switch is released, so Timer1 can then be read as a stable elapsed-time value.

See Also:

  • StartTimer — starting the timer that this stops
  • ClearTimer — resetting the timer’s count to zero, as used above
  • InitTimer1 — configuring the timer before starting it, as used above

Supported in <TIMER.H>

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