Yeah, Use the '628 -- The UART will greatly reduce the number of cycles needed to handle communications. Without it you might not be able to maintain the high datarate. Bob Ammerman RAm Systems ----- Original Message ----- From: "Ted Larson" To: Sent: Saturday, April 19, 2003 3:07 PM Subject: Re: [PIC]:Optical Encoder and PICs > Thanks Bob! This is super. Love the code sample! > > I was thinking about using a 20mhz 16F84A because I got a free one with my > PICStart Plus programmer. I wasn't planning on doing full-blown RS-232. I > was just going to do some simple 1-pin, TTL, serial, signaling. I was going > to send the data to a basic-stamp. Later on, as I get better at this PIC > stuff, I can toss the stamp and save $50. A stamp is just not fast enough > to watch 36k ticks per second, so I figured I could offload the time > senstive stuff to a PIC. > > Now...my understanding is that the only major difference between the 16F84 > and the 16F628 is less ports, no UART, and no PWM. Am I going to shoot > myself in the foot trying to use the F84 for this? > > Thanks, > > - Ted -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.