Samsung C8278X ユーザーズマニュアル

13-1 

The S3C8275X/C8278X/C8274X microcontroller can directly drive an up-to-128-dot (32 segments x 4 commons) 
LCD panel. Its LCD block has the following components: 

• LCD 

controller/driver 

•  Display RAM (00H−0FH of page 2) for storing display data   
•  32 segment output pins (SEG0−SEG31) 
•  4 common output pins (COM0−COM3) 
•  Three LCD operating power supply pins (V

LC0

−V

LC2

) 

•  LCD bias by Internal/External register 

The LCD control register, LCON, is used to turn the LCD display on or off, to select LCD clock frequency, to 
select bias and duty, and switch the current to the dividing resistor for the LCD display. Data written to the LCD 
display RAM can be automatically transferred to the segment signal pins without program control. 

When a sub clock is selected as the LCD clock source, the LCD display is enabled even in main clock stop or idle 
mode. 

8

D

a

ta BUS

SEG0-SEG31

32

COM0-COM3

4

V

LC0

-V

LC2

3

LCD

Controller/

Driver