Hi,

I have been trying to use a DS1820 in conjunction with an 18F452.

- I am using the parasite mode of power for the DS1820
(DQ pin connected for Data; VDD connected to GND)
- The DS1820 manual states that:

"In some situations the bus master may not know whether the DS18B20's
on the bus are parasite powered or powered by external supplies. The
master needs this information to determine if the strong bus pullup
should be used during temperature conversions."

Now, I have the DS1820 pin pulled up to VDD (+5V) using a 4.7k
resistor and connected to RA0 of the 18F452.

My question is:
How can I pullup RA0 while TRISA is configured as HiZ mode (input,
TRISA.0 =3D 1) ? That line from the datasheet has added a bit of
confusion to my mind.

Any ideas ?

Thanks,
Manu
--=20
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