HD44780 Samsung KS107 Displays Martin Elich April 11, 2012 Martin Elich Displays HD44780 Samsung KS107 Features PIN assignments Operation modes Hitachi HD44780 widely used in text displays usually from 1x8 to 4x40 characters can be controled with 4 or 8 data wires 4x40 displays have two controlers displays usualy have 16 pins including power, contrast control, backlight different character sets HD44780A00 - english and other world languages HD44780A02 - more focused on european languages HD44780Bxx - custom character sets Martin Elich Displays HD44780 Samsung KS107 Features PIN assignments Operation modes PIN assignments 1 Vss GND 2 VDD VDD +5V 3 Vee, V0 contrast 4 RS 0 - control, 1 - data 5 R/W 0 - read, 1 - write 6 E clock 7 DB0 data 0 8 DB1 data 1 9 DB2 data 2 10 DB3 data 3 11 DB4 data 4 12 DB5 data 5 13 DB6 data 6 14 DB7 data 7 15 LED+ anode backlight 16 LED- cathode backlight Martin Elich Displays HD44780 Samsung KS107 Features PIN assignments Operation modes Operation modes 8-bit data all DB pins are used for data set all 8 bits on DB pins then tick on E 4-bit data only DB4-DB7 is used for data DB0-DB3 is connected to ground set the highest 4 bits on DB4-DB7 then tick on E set the lowest 4 bits on DB4-DB7 then tick on E Martin Elich Displays Circuit 4-bit operation mode HD44780 Samsung KS107 Features PIN assignments Samsung KS107 widely used in cheap graphical displays resolution of 128 x 64 points not many features displays have two controlers operated as ”remote memory” no character set Martin Elich Displays HD44780 Samsung KS107 Features PIN assignments Memory organisation Martin Elich Displays PIN assignments 1 Vss GND 2 VDD power supply 3 V0 LCD driver supply voltage 4 D/I data input/output pin of internal shift register 5 R/W Read or Write 6 E Enable signal 7 DB0 data 0 8 DB1 data 1 9 DB2 data 2 10 DB3 data 3 11 DB4 data 4 12 DB5 data 5 13 DB6 data 6 14 DB7 data 7 15 CS1 Chip Selection 16 CS2 Chip Selection 17 RES Reset Signal 18 VEE contrast?? 19 A anode backlight 20 K cathode backlight Circuit 4-bit operation mode