Correcting timer0 reading

[chris414]

According to the PIC18F2550 datasheet:

If the TMR0 register is written to, the increment is inhibited for the following two instruction cycles. The user can work around this by writing an adjusted value to the TMR) register.

Does that mean that when I want to reset the timer I should use:

WriteTimer0(2);

 

[BeeBop]

According to the PIC18F2550 datasheet:



Does that mean that when I want to reset the timer I should use:

WriteTimer0(2);

Yes, but even more accurately:
WriteTimer0( theValueYouWant + 2);

(just add two to the value you want to write to the timer.)

 

[chris414]

Thanks for the quick reply

 

[erginbekar]

ı want to stop timer0 how can ı do that.

 

[upand_at_them]

ı want to stop timer0 how can ı do that.

Clear the Timer0 interrupt enable flag (TMR0IE) or clear the global interrupt enable flag (GIE). That's how it gets turned on in the first place.

 

[Mike - K8LH]

Doesn't that only stop TMR0 interrupts?

 

[Pommie]

Clearing bit 7 of T0CON stops timer0.

Mike.

 

[upand_at_them]

Then pull the power cord?

 

[upand_at_them]

Not all PICs have a T0CON register.

 

[Pommie]

Not all PICs have a T0CON register.

The one the OP is using does.

Mike.

 

[upand_at_them]

The person asking about turning off Timer 0 is not the OP.

 

[erginbekar]

thanks very much. ı'm using pic16f877.ı want to do that. ım explaning.a signal range from 0 volt to 5 volt is coming RE5 pin.and the timer start to count and then another current signal is applied RE6 when it is applied ı want to stop count.and calculate the mikroseconds which timer counts,and then ı will find the cos fi.ı cant write this code please help me.

 

[erginbekar]

real aim of me is the timer0 start to count when voltage(0 volt-5 volt) come Re5 and then when the current signal come Re6 pin timer0 is stopped.the time between this duration will be calculated and then is converted angle.that give me the angle between voltage signal and current signal.(cos fi).thanks for helping from now.