programmable delay of around 1us using pic18f8722 and 20 Mhz crystal.....

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jit_singh_tara

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hello friends ,
i was making a customised function for generation of delay say : delay_custom_us(unsigned int).

Now the problem is i am not able to get 1us delay and delays in its multiples.The moment i use for or while loop they consume instruction cycles and hence additional time .Please suggest what to do and how. I want precise delay of 1us ,10us , so that whatever parameter i give in function i should get that delay.
please suggest how to proceed.
 
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you will not be able to get reliable delays from a subroutine unless you are willing to look at the disassembly.

the most efficient (from a programming point of view) and the least efficient (from a code size point of view) way to get reliable but short delays is to use NOP().

for longer and reliable delays (>100us) you have to rely on timers.
 
do i have to use a for loop with a nop(); the for loop itself consumes instruction cycles, how will i get precise delay........?
 

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