# Timer1, CC5X & 16F631

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#### Nayth

##### New Member
Hi

I'm trying to understand how to make the timer1 work

I have input on PORTA.4 and it pulses, and I want to check if there's more or less than 10 seconds between the pulses

Code:
TMR1CS = 0; //internal clock
TMR1ON = 1; //enables TIMER1
T1OSCEN = 0; //oscillator is shut-off
TMR1H = 0x00;
TMR1L = 0x00;

Then I thought I could do something like

Code:
if(Timer1 > 10)
{
//Do Stuff
}else{
//Do something else
}

I know the above code wont work and this is where I need your help, cause I just can't seem to find any info about how to set up Timer1 and then check how far it's counted.

Please write if I should supply more code

#### Nayth

##### New Member
If I set
Code:
TMR1H = 0xFDE8;

Shouldn't it count to 65,000 and then roll over?

Another questen is, why is my program slowing down when I execute this command?
Code:
TMR1IF = 0;

That command should reset the interrupt flag for the timer, no?

I'm so lost with this Timer1, please help if you can

#### Nayth

##### New Member
Same slowdown if I use
Code:
T1IF = 0;

I can't crack my head around why it slows down when I call that function

There's no slowdown when I reset the interrupt bit for Timer0

Anybody have an idea?

Last edited:

#### Nayth

##### New Member
I also get an error saying that
Code:
Symbol 'TMR1' is undefined

Anybody know what that is, and what I can do about it?

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