Hi,

I am having a problem with waking my 16F628 from SLEEP, I want it to =
wake up when the button is pressed, in other words RB0 is now at 0V. I =
have set the PIC to wake up on the falling edge, does this mean that =
when the button is at 0V =3D PIC now awake?, as this is how I understand =
it?

Problem=3D If long cables are used for the switch, it picks up noise and =
the software thinks the button has been pressed!
=20
The problem is that I cannot find away of debouncing the button, as the =
way I have it configured, it will not Wake Up until the button is =
pressed AND released, the exact opposite of what I want.

I want it to wake on Button down AND wait X milli seconds, then check it =
is still at 0V, the code I have written, is below, and the button =
connections, any ideas where I am going wrong?

Thanks Gary
=20

=20
----- +5V
  |
----
|   | 10K Resistor
|   |
----
  |
  |---------------------------------- to RBO
  |
Button here
  |
  |
----- 0V





Code enters here

;------------------------------------------------------------------------=
------=20
call  Goto_Sleep     ;Returns here after Wake Up
;------------------------------------------------------------------------=
------=20
=20
Pseudo Code here

Test Button =3D 0V
Wait 20ms
Test Button =3D 0V
No =3D Goto_Sleep=20
Yes =3D Do something

End of Pseudo Code=20

;------------------------------------------------------------------------=
------=20

Goto_Sleep
=20
 clrf  INTCON
 call  Set_RB0_Interrupt=20
 bcf  RB0_Int_Flag              ;MUST clear this before Sleep
 sleep                                 ;as any previous activity
 return                                ;on RBO stops sleep mode
 =20
;------------------------------------------------------------------------=
------

Set_RB0_Interrupt
=20
 clrf  INTCON
 BSF   INTCON,INTE              ;Enable interupts on RB0/INT
=20
 movlw  B'10000000'             ;Bit6 Selects RB0 Interrupt edge
 movwf  OPTION_REG          ;BIT7 PortB pullups =3D off
=20
 return

;------------------------------------------------------------------------=
-------

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