TMR0 as counter

[Darrel Taylor]

Or you could just count the Overflows from timer0 and make it a 16-bit or larger counter.

DT

[savnik]

Or you could just count the Overflows from timer0 and make it a 16-bit or larger counter.

DT

Now count the TMR0 and also count the prescaler (256)

result var word ' 16 bit result of count, high from tmr0 low from prescaler
TMR0 = result.Byte1
prescaler = result.Byte0

But i cann't take the decimal numbers , only the integer

[sayzer]

Savnik,

I understood that you already have a PCB and can not change it.

Then, if you are not using RB6, then just short it to RA4 manually with a tiny cable and use Timer1.

-----------------

[savnik]

Then, if you are not using RB6, then just short it to RA4 manually with a tiny cable and use Timer1.-----------------

unfortunately i use RB4-RB7 for LCD

[Acetronics2]

Now count the TMR0 and also count the prescaler (256)

result var word ' 16 bit result of count, high from tmr0 low from prescaler
TMR0 = result.Byte1
prescaler = result.Byte0

But i cann't take the decimal numbers , only the integer

Hi, Savnik,

so, you want to use a ... 24 bits counter !!!

One more good reason to turn to 18F1320 AND use PBPL ... instead of PBPW !

But, once more ... will you tell us the PIC Osc frequency and the frequency range you intend to measure at PORTA.4

... as I smell something really interesting ...

Alain

[savnik]

Hi, Savnik,

so, you want to use a ... 24 bits counter !!!

One more good reason to turn to 18F1320 AND use PBPL ... instead of PBPW !

But, once more ... will you tell us the PIC Osc frequency and the frequency range you intend to measure at PORTA.4

... as I smell something really interesting ...

Alain

Now i use xtal 4mhz and the frequency range is from 300khz to 6mhz

[skimask]

But i cann't take the decimal numbers , only the integer

And yet AGAIN!!!
PBP doesn't do fractional numbers by default!!!!! NEVER has, NEVER will!!!
You have to create your own method to extract any fractions you need.
Multiply the number your dealing with by 100, the 2 rightmost digits are your fraction....simple as that!
Or maybe not...

[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)