Hi, in a serial communication program, do I have to "SETB P3.0" in order to receive from the serial port ??
But variant of 8051 does matter with this verbiage it does "do I have to "SETB P3.0"" some chips (e.g. f12x) have the UART on other pins.
Erik
and some chips have more than 1 UART - so "the UART" is meaningless!
and more modern chips often have more things that need to be configured; eg, www.8052.com/.../182918
So, again, it really is important to state exactly what chip you are using!