Hi !
A few things...

Where do you clear INTF ?
Should/could be done just before re-setting INTE and GIE.

See data sheet, page 63, section 9.4.1, lines 6-8.

(Use "goto label" instead of "goto $-3" so we don't
 have to count instructions...)

Jan-Erik.



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John and Anne Duncan
> Sent: den 23 april 2004 06:18
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: PIC12F675 and INTF
>
>
> Hello,
>
> I have been working on my first project using a PIC12F675.  This is a
> low powered battery operated device that should stay in sleep
> mode until
> woken up by a button press to do it's thing.
>
> I am using INTF to wake up from sleep.  I have followed the manual and
> ensured that the comparator is off and that  the ADC is switched off.
> However the interrupt doesn't behave as I expect it should.
> as soon as
> GIE is set, execution branches to the ISR, even though there
> has been no
> +ve going edge to trigger the interrupt.  GPIO2 is tied low
> until it is
> pulled high by the press button.
>
> The test code below shows how I have initially set up the GPIO pins in
> the 'main' routine.  I would expect that GPIO0 would toggle until the
> switch is pressed but instead GPIO1 will toggle.  It appears however
> that the '
> 'bsf   GPIO, 0' statement after GIE is executed, as GPIO, 0 goes high
> before the ISR is executed.
>
> Perhaps I am missing something in my GPIO initialization??  Any help
> would be greatly appreciated.
>
> John
>
> ;=============================================================
> =================
> ; intf_test.asm --
> ;  Bare bones quick test to see why INTF doesn't work properly in
> vibeclock.asm
> ;
> ;=============================================================
> =================
>         list p=12f675
>         include "p12f675.inc"
>         __idlocs 0x6789
>         __config   _MCLRE_OFF & _BODEN_OFF & _CP_OFF & _PWRTE_ON &
> _WDT_OFF & _INTRC_OSC_NOCLKOUT
>
>
>     messg "INTF Test"
>
>     org    0x00
>     goto    main
>
>     org    0x04
>
>     bsf    GPIO, 1
>     nop
>     bcf    GPIO, 1
>     goto    $-3
>
> main
> ;; Initialize I/O pins
>     clrf    GPIO
>
>     ;; Turn comparator OFF
>     movlw     0x07
>     movwf     CMCON
>
>     ;; Switch to Bank 1 to initialize registers in that bank
>     bsf    STATUS, RP0
>
>     ;; Ensure ALL inputs are digital inputs initially
>     clrf     ANSEL
>
>     ;; Initialize TRISIO
>     movlw    b'11111100'
>     movwf    TRISIO
>
>     ;; Initialize OPTION_REG
>     movlw    b'11011111'
>     movwf    OPTION_REG
>
>
>     bcf    STATUS, RP0     ;Bank 0
>
>     bsf    INTCON, INTE
>     bsf    INTCON, GIE
>
>     bsf    GPIO, 0
>     nop
>     bcf    GPIO, 0
>     goto    $-3
>
>         end
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.