Department of Computer Scien

ce and Information Engineering

National Cheng Kung University

HANEL

BASICS OF SERIAL COMMUNICA-TION(cont’)

‰Serial data communication uses two methods

¾Synchronous

method transfers a block of

data at a time¾Asynchronous

method transfers a single

byte at a time

‰It is possible to write software to use either of these methods, but the programs can be tedious and long

¾There are special IC chips made by many manufacturers for serial communications

ƒUART (universal asynchronous Receiver-transmitter)ƒUSART (universal synchronous-asynchronous Receiver-transmitter)