Minimum Delay using a PIC?

[amitdandyan]

Can anyone please tell me, what is the minimum delay I can get using a PIC ? I want a delay of 500ns.....Please also specify the series of the PIC...

 

[btbass]

The minimum delay would be one 'nop()' instruction.
Which with a 4 Meg oscillator would give you 1uS delay.
An 8 Meg oscillator would give you your 500nS delay.

 

[amitdandyan]

void main()
{
TRISB = 0;
PORTB = 0;
for(;
{
PortB.F0 = 0;
asm
NOP;
PortB.F1 = 1;
}
}

I have developed this program to get the minimum delay from PIC16F876-A.....I hv used a crystal of freq. 20MHz.....but i hv not been able to solve the purpose...as no output is visible on Oscilloscope....!!!!!!!!!!!!!!!!!!!
Please help...

 

[madhan7710]

Hi,

Try giving equal delay for both on cycle and off cycle.
like this...


loop:

portb.0 =0
nop
portb.0 =1
nop

goto loop