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S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X LCD CONTROLLER/DRIVER
13-1
13 LCD CONTROLLER/DRIVER
OVERVIEW
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
Data BUS
SEG0-SEG31
32
COM0-COM3
4
V
LC0
-V
LC2
3
LCD
Controller/
Driver
Figure 13-1. LCD Function Diagram