>> to communicate to a PIC with a PC. I just need to transmit signals to the >> PIC via PC. I DON'T need the PIC to talk to the PC. Do I need a rs-232 ic >> or what?? I'm new to this and am not sure what it will take. Any advise >and >> suggestions would be apprecited!!!! If the PIC is only receiving data from PC and never talking back, all you need is a resistor and a little of bit-bang routine. Do not use RS-232 IC because you will be wasting money and board space. Regards, Octavio ====================================================== Octavio Nogueira - e-mail: nogueira@mandic.com.br http://www.geocities.com/~oct_nogueira "ProPic" Production PIC Programmer Windows under US$20 ====================================================== -----Mensagem original----- De: Rogerio Odriozola Para: PICLIST@MITVMA.MIT.EDU Data: Quarta-feira, Maio 06, 1998 05:15 Assunto: Re: RS-232 using PIC 16F84 or 12C509 >You say you only want the PC to comunicate to the PIC. If you want level >conversion (sort of) the smallest and cheapest is to go with the 1489. 14 >pin dip or soic and about 39 cents. No hassle with caps. > >Rogerio > > > > > >tbrisebois@FPMX.COM on 06/05/98 10:29:09 AM > >Please respond to PICLIST@MITVMA.MIT.EDU > >To: PICLIST@MITVMA.MIT.EDU >cc: (bcc: Rogerio Odriozola/MTY/TVA/Dataflux) >Subject: Re: RS-232 using PIC 16F84 or 12C509 > > > > >You can use the MAX206 which is offered from Maxim which is an 24 pin >SSOP which is very small and only about $2.00. >> > I know this has been mentioned before, I looked at the archive and I >don't >> have lots of free time on my hands. All I need to know is what will it >take >> to communicate to a PIC with a PC. I just need to transmit signals to the >> PIC via PC. I DON'T need the PIC to talk to the PC. Do I need a rs-232 ic >> or what?? I'm new to this and am not sure what it will take. Any advise >and >> suggestions would be apprecited!!!! >> >> >> You can get there with just connecting the pic directly to the PC. If you >> do, the logic 1 in the pic output is a zero to the PC. >> I've written bit-banger full duplex com for the '84. In my case, we used >a >> buffer transistor, but it wasn't strictly needed. >> If you want a little protection on the port pins, a 470 ohm resistor >would >> be a good idea. >> Any solution that only sends +5 and ground is violating the spec, but the >> 1489 receivers (maybe the most popular 232 Rx chip >> on the planet) only sense + and ground. The '88 transmitter sends +/-V >as >> per spec. >> >> A maxim chip will get you there, but it's large, and expensive. >> >> The soft uart routines have been done to death, so I imagine you've got >that >> code already. >> >> >Todd Brisebois >Engineering >Fitel-Photomatrix >tbrisebois@fpmx.com (613)228-9695 ext.229 >