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"Stop" Timers question

 
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bwhiten



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"Stop" Timers question
PostPosted: Mon Feb 04, 2008 1:26 pm     Reply with quote
I am looking at a Microchip code sample that mentions the next step in an ISR as "StopTimers();". No further description of the function is given of course, so my question is, would disabling a timer be the same as stopping one and can the last timer value still be read after disabling? I'm using a 16F887 PIC.
PCM programmer



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PostPosted: Mon Feb 04, 2008 1:50 pm     Reply with quote
Post the appnote number and post a link to it.
bwhiten



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App Note AN1104
PostPosted: Mon Feb 04, 2008 2:01 pm     Reply with quote
http://ww1.microchip.com/downloads/en/AppNotes/01104A.pdf

Examples 1 and 3.
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PostPosted: Mon Feb 04, 2008 2:37 pm     Reply with quote
The short answer is:

You can stop Timer1 by setting the TMR1ON bit = 0 in the T1CON register.
Example:
Code:

#byte T1CON = 0x10
#bit TMR1ON = T1CON.0


void main()
{
TMR1ON = 0;   // Turn Timer1 off


TMR1ON = 1;   // Turn Timer1 On


while(1);
}


Timer0 doesn't have an on/off bit.

To really solve your problem I'd have to read the whole appnote, and
I don't want to do that right now.
bwhiten



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PostPosted: Mon Feb 04, 2008 9:11 pm     Reply with quote
Really not a problem, just clarification. I did test and disabling does not clear the count so it accomplishes my purpose. I like using your bit method better because it is clearer to me what I am accomplishing, rather than the T1_DISABLE control for SETUP_TIMER_1() function.
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