Hi, in a serial communication program, do I have to "SETB P3.0" in order to receive from the serial port ??
You are working at the level where that kind of understanding is imoprtant!
You need to either gain some understanding, or ensure that your team includes someone with that understanding.
should, of course, be: "important".
Here's some basic electronics links:
http://www.kpsec.freeuk.com/ www.electronics-tutorials.ws/ www.google.com/search