here delay is 100ms and here also it took around 22seconds while on.

geetansh wrote:
>=20
> *
> 0000:  MOVLW  00
> 0001:  MOVWF  0A
> 0002:  GOTO   019
> 0003:  NOP
> .................... // Source code file: ENDLESS.C=20
> .................... // Program function: Outputs variable count=20
> .................... #include <16F877A.h>=20
> .................... //////// Standard Header file for the PIC16F877A
> device ////////////////=20
> .................... #device PIC16F877A=20
> .................... #list=20
> .................... =20
> .................... #use delay(clock=3D4000000)=20
> 0004:  MOVLW  21
> 0005:  MOVWF  04
> 0006:  BCF    03.7
> 0007:  MOVF   00,W
> 0008:  BTFSC  03.2
> 0009:  GOTO   018
> 000A:  MOVLW  01
> 000B:  MOVWF  78
> 000C:  CLRF   77
> 000D:  DECFSZ 77,F
> 000E:  GOTO   00D
> 000F:  DECFSZ 78,F
> 0010:  GOTO   00C
> 0011:  MOVLW  4A
> 0012:  MOVWF  77
> 0013:  DECFSZ 77,F
> 0014:  GOTO   013
> 0015:  GOTO   016
> 0016:  DECFSZ 00,F
> 0017:  GOTO   00A
> 0018:  RETURN
> .................... void main()=20
> .................... =20
> .................... {=20
> 0019:  CLRF   04
> 001A:  BCF    03.7
> 001B:  MOVLW  1F
> 001C:  ANDWF  03,F
> 001D:  BSF    03.5
> 001E:  BSF    1F.0
> 001F:  BSF    1F.1
> 0020:  BSF    1F.2
> 0021:  BCF    1F.3
> 0022:  MOVLW  07
> 0023:  MOVWF  1C
> .................... while(1)=20
> .................... {=20
> .................... output_D(255);=20
> 0024:  CLRF   08
> 0025:  MOVLW  FF
> 0026:  BCF    03.5
> 0027:  MOVWF  08
> .................... delay_ms(100);=20
> 0028:  MOVLW  64
> 0029:  MOVWF  21
> 002A:  CALL   004
> .................... output_D(0);=20
> 002B:  BSF    03.5
> 002C:  CLRF   08
> 002D:  BCF    03.5
> 002E:  CLRF   08
> .................... delay_ms(100);=20
> 002F:  MOVLW  64
> 0030:  MOVWF  21
> 0031:  CALL   004
> .................... }=20
> 0032:  BSF    03.5
> 0033:  GOTO   024
> .................... }=20
> 0034:  SLEEP
>=20
> Configuration Fuses:
>    Word  1: 3F73   RC NOWDT PUT BROWNOUT NOLVP NOCPD NOWRT NODEBUG
> NOPROTECT
>=20
>=20
> this is d .lst file and no isr is here. so what i should do now?
> i think there might be a problem in crystal oscillator,so if i use logic
> analyzer of pickit 2 to know the frequency then problem will become much
> clear.
>=20
>=20
> Joe Wronski wrote:
>>=20
>>   First, you prove that a prescaler is there (which I doubt).  You can=20
>> do that by getting CCS to output a lst file, and you analyze what the=20
>> compiler is doing before it gets to main().  You check to see if it is=20
>> doing anything with the clock to add a prescaler.  You can also look at=
=20
>> the disassembly to sanity check the values passed to the delay()=20
>> function (it's probably a macro).
>> My guess is that a floating input pin RBx is causing interrupts and the=
=20
>> isr is using up most of the processors time.  So, you check to see if=20
>> the compiler put any isr vectors in there.  And you prevent portb=20
>> interrupt on change on floating inputs by enabling portb pullups.
>> If you have debugger capabilities, it is easier to do some of these=20
>> things by setting breakpoints, examining register contents, and single=20
>> stepping.   Inserting dummy code in main() before the loop will let you=
=20
>> set a breakpoint.  The dummy code should do something that doesn't get=20
>> optimized out, like "unsigned char n; n =3D PORTB;"
>> If it's the watchdog timer, or something else causing a reset, you will=
=20
>> find that if you set a breakpoint before the loop, the breakpoint will=20
>> be hit more than once.  You can also set a breakpoint at the isr vector=
=20
>> to see if it is a robue interrupt.
>>=20
>> Joe W
>>=20
>>=20
>> On 6/18/2011 5:03 AM, geetansh wrote:
>>> how can i remove that prescaler then?
>>>
>>>
>>>
>>> RussellMc wrote:
>>>>> when the delay between on off  was set
>>>>> 10ms the leds took 2.3sec
>>>> 2300 mS / 10 mS ~~~=3D 256
>>>>
>>>> Delay MAY be out by a factor of 256, indicating that there is possibly
>>>> a
>>>> prescaler in the clock that is not being accounted for.
>>>>
>>>>
>>>>                     Russell
>>>> --=20
>>>> http://www.piclist.com PIC/SX FAQ&  list archive
>>>> View/change your membership options at
>>>> http://mailman.mit.edu/mailman/listinfo/piclist
>>>>
>>>>
>>=20
>>=20
>> --=20
>> Joe Wronski
>> Stillwater Embedded Engineering
>> www.stillwatereng.net
>>=20
>> --=20
>> http://www.piclist.com PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>>=20
>>=20
>=20
>=20

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--=20
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