On 20/06/2011 23:18, jim@jpes.com wrote:
>   Let me try this again without all the typos and spelling mistakes.
>   That's what I get for going too fast.
>
>   All,
>
>    I am trying to get familiar with the PIC16F1827 part that has the
> Capacitive Sensing Module on it.
>    As a start, I am setting each bit on PORTB sequentially.  This is just
> a familiarization exercise.
>    However, I can't get bits 1,2 and 5 to toggle.  I have tried turning
> off any module associated with
>    PORTB, but I still cannot get it to work. Bits 0, 3, 4, 6, and 7 work
> fine.
>    I am probably missing turning off something, but I just don't see what
> it is.
>
>    Below is listed what I have tried turning off so far.
>
>            clrf	PORTB       ; Clear the PORT
>
>   	movlw	0x01        ; Make pins OUTPUTS
>   	movwf	0x08
>   	clrf	TRISB
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x03        ; Disable Serial Port (UART)
>   	movwf	0x08
>   	bsf	RCSTA,7
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x03        ; Make Pins Digital, Not Analog
>   	movwf	0x08
>   	bcf	ANSELB,7
>   	movlw	0x00
>   	movwf	0x08
>   =09
>   	movlw	0x04        ; Turn Off Synchronous Serial Ports (SPI&  I2C)
>   	movwf	0x08
>   	clrf	SSP1CON1
>   	clrf	SSP2CON1
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x01        ; Turn Off A/D Converter
>   	movwf	0x08
>   	clrf	ADCON0
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x00        ; Turn Off Capacitive Sense Module
>   	movwf	0x08
>   	clrf	CPSCON0
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x07        ; Turn Off Digital Signal Modulator
>   	movwf	0x08
>   	clrf	MDCON
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x02        ; Turn Off D/A Converter Module
>   	movwf	0x08
>   	clrf	DACCON0
>   	movlw	0x00
>   	movwf	0x08
>
>   	movlw	0x02        ; Turn Off Comparator Module
>   	movwf	0x08
>   	clrf	CM1CON0
>   	movlw	0x00
>   	movwf	0x08
>
>    If anyone sees anything that I am doing wrong, or sees something that
> I am missing turning off
>    (or on if it should be on) to make PORTB work, please let me know.  I
> appreciate it.
>
>    Thanks and Regards,
>
>   Jim
>
>
>
>

Shouldn't that be clrf ANSELB if you want make all the pins digital?
Although it shouldn't affect the output..
Couple of guesses:
Just checked my datasheet and it says it has more than one I2C/SPI=20
peripheral - check page 126, section 12.3.4 for the pin priorities and=20
see if you can see anything there. I would turn SSPCON2 off to start=20
with, and the CCP peripheral.
Check you are not having a rmw issue when you toggle the pins too.


--=20
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