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PROBLEMS WITH #use delay(clock=4000000)

 
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dax



Joined: 19 Jun 2005
Posts: 2

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PROBLEMS WITH #use delay(clock=4000000)
PostPosted: Wed Aug 03, 2005 3:55 am     Reply with quote

Hi

Im working with PIC18LF4620 with 4 MHz external clock.

my header is

#include <18F4620.h>
#device ICD=TRUE
#fuses NOWDT,XT,NOPUT
#use delay(clock=4000000)
#use rs232(DEBUGGER)

and the program never reach the main function, it remains at the #use delay(clock=4000000) line. The clock seems to work fine, my CCS compiler version its 3.224. If somebady knows abut this, all help its welcome,

thanks
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dax
mickey231bhq



Joined: 06 Apr 2005
Posts: 19
Location: Formosa

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PostPosted: Wed Aug 03, 2005 4:14 am     Reply with quote

XT???? Very Happy
rnielsen



Joined: 23 Sep 2003
Posts: 839
Location: Utah

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PostPosted: Wed Aug 03, 2005 8:42 am     Reply with quote

Quote:
XT???? Very Happy


In other words, try using HS instead of XT. Anytime you are running at 4MHZ or faster you should use HS (High Speed) fuse.

Ronald
PCM programmer



Joined: 06 Sep 2003
Posts: 18368

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PostPosted: Wed Aug 03, 2005 12:42 pm     Reply with quote

Many PIC data sheets recommend XT for 4 MHz operation.
Examples:
16F877
16F877A
16F628
16F628A
18F452
I have used XT mode at 4 MHz on most of the PICs above with no problem.

For newer PICs, the data sheets give the option of using XT or HS mode
for a 4 MHz crystal. Examples:
16F88
16F688
18F4620

I don't think using XT mode is causing his problem.
It's more likely that he needs to add NOLVP to the #fuses statement.
That might fix the problem.
Kit
Guest







PostPosted: Wed Aug 03, 2005 9:15 pm     Reply with quote

#fuses NOWDT,XT,NOPUT

use
#fuses NOWDT,HS,NOPUT

or you can add
#fuses NOWDT,HS, NOPUT, NOLVP

I only manage to get my PIC run after adding NOLVP.

if you dont want to use MCLR
#fuses NOWDT,HS, NOPUT, NOLVP, NOMCLR (try this first)
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