Timer0 and interrupt questions.

[glenjoy]

I would like to ask if how to initialize and start timer0 in CCS C.

In 8051, after loading the Timers ans setting the interrupts, you can set TR register equal to 1 to start the timer running.

IN PIC, how to start timer running and what is the difference between set_timer0() and setup_timer_0().

Another if I already enabled interrupt and i have the loop f(;;) will the system run forever and interrupt when needed?

Thanks.

[Ttelmah]

The timer runs all the time if a clock is present.
Setup_timer_0, deterines where the clock is to come from, what prescaler is to be used etc..
Set_timer_0, puts the value into the counter register. It can be pretty useless in some cases, since at faster rates, the register will change by the very next instruction. Loading the counter registers, is something to only do with 'care'. Look for a lot of threads about this...

Best Wishes

[glenjoy]

You have not answered my question, I am asking if how to get a timer running after loading it.

[dyeatman]

Ttelmah,
You try to help him and all he does is "smart mouth" you! I'd leave him to find his own answers.....

[glenjoy]

Hey, what is your problem, I only told him that I am asking is the start of timer.

You are the big mouthed fool here.

[Ttelmah]

The timer is already running. There is nothing else to do. You can change the clock source, but the timer _keeps running all the time_. There is no secret instruction to start it, or magic involved.
Hence the comments about your reply.....

Best Wishes

[glenjoy]

Hi,

I hope you get not offended my reply as someone interpreted it as offensive.

Now, how to stop the timer from counting?

Thanks.

[Ttelmah]

All you do is ignore the interrupt, if using this.
Understand, that Timer0, is a very basic counter indeed. Some of the other timers (assuming your chip has them), have more features, such as the ability to be used with the CCP, to give automatic resetting at particular counts, possibly interrupts after multiple rollovers (on ones that support a postscaler), and gate control. Potentially, if you are not using the T0CKI pin, and timer0 on your chip supports thus, you can switch timer0, to be clocked from this pin, and it will then stop (though make sure you have the pin pulled high/low, with an external resistor to avoid potential noise problems before doing this).
I suggest you pull the application note from the Microchip site, on using the timers. Basic 'rule' with CCS, is to look first at what your chip's hardware supports, and therefore the chip's data sheet, and then ask how to use the feature in CCS.

Best Wishes

[ckielstra]

[bb]