This has been discussed several times: You will find the following answers, choose 1 (or more): - Make your unused pins outputs, and don't connect anything to them - Make your unused pins inputs, and .... --- Tie them directly to Vcc --- Tie them directly to GND --- Pull them up to Vcc --- Pull them down to GND --- Rely on the built in pull-up resistors on PORTB Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) ----- Original Message ----- From: Bala Chandar To: Sent: Monday, November 06, 2000 7:36 AM Subject: Re: [PIC]: Can PIC's inputs be left floating? > In designing circuits with CMOS chips, the basic rule is that you should not > leave any unused inputs floating. They are tied either to +V or Ground or > there is a pull-up / pull-down resistor. Is the same rule applicable when > you design circuits using PIC micros? If you define a port or a pin as > input, are there internal pull-up / pull-down resistors that are enabled > automatically? > > Thanks for helpful responses. > > Regards, > Bala Chandar > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST