me:
>pin tristated off

downside of this is having the pin tristated if it is not pulled low -> possible source of noise
into the chip.

might be a good opportunity to make use of the usually irritating lack of a shadow register for the
port states:

; pin0 of port D is either connected to ground, vcc, or open circuit
; if o/c or vcc pin0 is driven high, if connected to ground pin0 is driven low
bsf   PORTD, 0    ; try and pull the pin high
clrw              ; (and wait a bit to let the voltage rise)
xorwf PORTD, F    ; read state of port D and drive it that way
                  ; if pin0 was pulled low it will now be driven low
                  ; if pin0 was floating or high it will now be driven high

then again, no obvious advantages to that over:

; pin0 of port D is either connected to ground or open circuit
; if o/c C will be set, if connected to ground C will be cleared
bsf   PORTD, 0    ; try and pull the pin high
nop               ; wait a bit to let the voltage rise
rrf   PORTD, W    ; state of pin0 port D into Carry
bcf   PORTD, 0    ; pull the pin low



oh well... probably just pointless rambling, but the use of 'clrw/ xorwf portX, F' does feel like it
_should_ be really useful.

Regards,
Simon

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