> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Tom=E1s =D3 h=C9ilidhe
> Sent: 22 August 2008 17:09
> To: Microcontroller discussion list - Public.
> Subject: [PIC] Where's the interrupt coming from?
> =

> =

> I've got 7 independent push buttons on my board. They are connected to
> B0, B1, B2, B3, B4, B5 and D6.
> =

> When a push button is pressed, it provides a path to ground.
> =

> B0 through B5 are floating when they are not pressed; the idea here was
> to use the 887's internal pull-up's, but I can't get them to work.
> =

> Another problem I'm having is that the microcontroller keeps resetting
> if B3 is left floating, but I don't understand why because I've got all
> interrupts disabled.
> =

> Here's my config code:
> =

> __CONFIG(FCMDIS & IESODIS & BORDIS & UNPROTECT & MCLRDIS & PWRTEN &
> WDTDIS & INTIO);
> =

> And here's my start-up code:
> =

> void StartupConfig(void)
> {
>     ANSEL =3D 0;  /* Turn off Analog-to-Digital */
> =

>     INTCON =3D 0;   //Disable all interrupts
>     CM1CON0 =3D 0; //Comparators off
>     CM2CON0 =3D 0; //Comparators off
> =

>     WPUB =3D 0b00111111;  /* Individually set pull-up's for Port B */
>     IOCB =3D 0b00000000; /* Disable interrupts for Port B */
> =

>     OPTION &=3D ~0b10000000u;   /* Turn on pull-up's for Port B */
> }

There are two ANSEL registers for the 16F887; ANSELH is the one that deals =
with PORTB pins.  Weak pull-ups will be disabled if the port is configured =
for analog input.

Regards

Mike

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