Varying results of delay() function in PIC

[suwaii]

pic delay

hi

i use delay(1000) of MikroC in the programming pic18f452 but the problem the PIC wlll not delay correct and i see sometimes if the voltage of PIC between 5v and 6v thePIC will give you correct delay if more or less than this the PIC will give wrong delay.... is this correct how i can get correct delay

 

[GSM Man]

pic delay function

What oscillator mode are using using and what value components?

 

[dimas_lilik]

delay pic 18

last month, i have problem like that. I know to solve the problem. Cristall.
Please check your oscillator with DSO.

 

[suwaii]

delay for pic

the crystal= 10mhz

what do you mean by componet value and DSO

 

[hock]

delay loop pic 18

can the delay function handle more then 256 (unsigned char)?
check the function prototype in the header file.

hock

 

[brasky]

Re: Delay in PIC

can the delay function handle more then 256 (unsigned char)?
check the function prototype in the header file.

hock

Definitely! it handles more than 256. In mikroC, it handles upto 10000.
example: delay_ms(10000) will give a delay of 10seconds.

 

[GSM Man]

Delay in PIC

How much deviation are you seeing? What type of crystal are you using - parallel or series? Do your load capacitors meet the requirements of the crystal?

 

[suwaii]

Re: Delay in PIC

the capacitor =22pf, crystal=10 mhz
PIC18f452
i make the dealy will work in the program if the input port pin#36= on
i use MikroC

what i see
if the voltage of PIC and (input port pin #36 on )between 5-7V the delay loop
will delay correctly
if more 7V the PIC will not give you right delay

can any one explain to me why

 

[suwaii]

Re: Delay in PIC

can any one explain to me why ??

 

[hugo]

Re: Delay in PIC

can any one explain to me why ??

7V ???

 

[the lion]

Delay in PIC

this problem happened to me
the reason was the power supply
it wasn't purely regulated