TMR0 as counter

[savnik]

Another question.

I use TMR0 as counter to measure the frequency at RA4
How i know, how many times the TMR0 overflow.
The maximum times is 3

For first overflow INTCON.2 = 1 , After;

pic16f88
xtal =4mhz
option_reg = %10110111

[skimask]

For first overflow INTCON.2 = 1 , After;

So clear it and at the same time, increment an 'overflow counter'.

[savnik]

So clear it and at the same time, increment an 'overflow counter'.

I have make this but increment only for 1

        overflow = 0
main:       
        TMR0 = 0

        'start count                      
        pauseUS 1000                          
        'stop count

        if INTCON.2 = 1 then overflow = overflow + 1           
        INTCON.2 = 0 
        Temp = TMR0
        gosub LCD
        goto main

[savnik]

Another question.

I use TMR0 as counter to measure the frequency at RA4
How i know, how many times the TMR0 overflow.
The maximum times is 3

For first overflow INTCON.2 = 1 , After;

pic16f88
xtal =4mhz
option_reg = %10110111

Until today i don't solve this problem.
To know how many times TMR0 has overflow;

[Archangel]

Until today i don't solve this problem.
To know how many times TMR0 has overflow;

So did you solve the problem, or not solve the problem?

[savnik]

So did you solve the problem, or not solve the problem?

No.
I use TMR0 as counter to measure the input frequency at RA4 for 256ms.
The frequency is between 0.3mhz and 8mhz.
My problem is how many times the TMR0 overflow.
I use pic16f88 and 4 mhz xtal. (I don't to change these)

[Archangel]

No.
I use TMR0 as counter to measure the input frequency at RA4 for 256ms.
The frequency is between 0.3mhz and 8mhz.
My problem is how many times the TMR0 overflow.
I use pic16f88 and 4 mhz xtal. (I don't to change these)

Here is a link to an example Mister_e posted on ME Labs site.
http://www.melabs.com/resources/samp...ed/counter.zip

Personally, I do not understand how a PIC can count faster than it's own oscillator is running 4mhz vs 8mhz, I think you will have to up the Frequency to 20, but I may be wrong too. I thought it took 4 cycles per instruction, likely that's wrong too.