Pic12f683, Trisio, High Z, A2d

[jmbanales21485]

Hello to all,

I have a little problem on the 12F683. I want to get the pin GPIO.0 to switch from a LOW state (GND) to a High impedence state (High Z) and while in High Z take an anolog to digital conversion at GPIO.4.

The problem with the current circuit and Code that i have (attached is a schematic and sample code) is that while in in the LOW State the A/D will be normal and read normal voltage. However, in the HIGH Z state the PIN GPIO.4 (or AN3) will jump to a HIGH state (i.e to VDD).

Does anyone have any suggestions on how I can go about achieving this task? Maybe another way of switching from High Z to Gnd? Any help would be greatly appreciated.

Sammple Code:

'Define ADCIN parameters
Define ADC_BITS 10 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS
Define OSC 4 'define oscilator
Volt VAR WORD
main:
TRISIO = %010000 'Set GPIO.0 as OUTPUT
LOW GPIO.0 'GND STATE
Pause 5000
TRISIO = %010001 'Set GPIO.0 as input (HIGH Z State)
pause 4000
ADCIN 3, Volt
if Volt >= 970 then loop
pause 1000
goto main

loop:
goto main
END

Schematic Attached:
Thank You All!