On Sat, Jul 06, 2013 at 07:08:16PM +0800, Electronic Consultation wrote:
> Guys,
>=20
> I want to reduce LedTimer after interrupt but it returned to 20 again=20
> after interrupt,
> Do you have idea how handle it ?

The Equate (EQU) you have below fixes the value of LedTimer to 20. Since
you were moving it to COUNT, I figured you wanted a constant 20 counts to
count down in COUNT (which I do not see a definition for).

Your code uses the RES directive to declare variables. If you want LedTimer
to change, then it needs to be a variable too.

BAJ

> thanks
> [CODE]LedTimer EQU .20 ;10 decimal (for content of the counter to get 100=
ms)
>=20
>      led_state_1
>                  bcf     INTCON,T0IF             ;clear the interrupt fla=
g
>                  bsf      PORTB, POWERLED         ;Turn on LED
>              movlw LedTimer
>                  movwf COUNT
>=20
>=20
>            ;counting
>=20
>           check_counter
>                          btfss INTCON,T0IF
>              goto  check_counter
>=20
>=20
>                       sublw .1
>                       btfss STATUS, Z        ;Is the result 0, clear COUN=
T
>=20
>=20
>             goto  check_counter     ;if false check the COUNTER again
>                       goto  next_state        ;if true  go to this statem=
ent
>=20
>=20
>=20
>          next_state
>                      clrf    COUNT             ;if false go to this=20
> statement
>                      incf    LedState,1            ; if 00 increase the=20
> state, for the next state
>=20
>                      return[/CODE]
> --=20
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--=20
Byron A. Jeff
Chair: Department of Computer Science and Information Technology
College of Information and Mathematical Sciences
Clayton State University
http://faculty.clayton.edu/bjeff
--=20
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