14 pin lcd has 8 data lines,vss,vdd,vee and three control signals such as RS(register select),EN(enable),R/W(read/write).7th bit of data bits work as a busy flag.to display character or string 1st you will have to write some commands in command register of lcd,and then data to be displayed is given to data register,while writing command or data R/W pin will be 0 (i.e.in write mode ) and while checking busy flag it will be equal to 1.RS=0(command register is selected),RS=1(data register is selected)