Not sure where you get the 55ms from, but 55ms/18hz is the timer interrupt 
frequency of the PC (personal computer) and should not have any effect on 
pic except for maybe reading or writing to the pic from the PC.  It is a PC 
thing.

Bill

----- Original Message ----- 
From: "R. I. Nelson" <rindesigns@charter.net>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Monday, November 28, 2005 11:19 AM
Subject: [PIC] newbie question on timing


> Using a basic compiled program using a for-next loop,  a flash PICchip.
> can I expect toget a pulse every 55 ms. or about 18pulses per second?
>
> I know a lot of it will depend on what speed I am running the chip at.
>
>


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