ST2202 datasheet(41/65 Pages) ETC

41 / 65 page

Sitronix

ST2202

Ver 2.0a

41/65

2003-May-05

external DC-DC converter, which generates a high voltage

for driving liquid crystal. POFF outputs “1” when clearing

LPWR (LCTR), and outputs “0” by setting this bit, which is

also the default value.

BLANK (Contrast control)

The LCD blank signal is used to control the contrast of

display by setting contrast level in LPWM[5:0] with “00000”

(default) represents a maximum level and “11111” is for

minimum. The BLANK signal achieves this function by

outputting a PWM signal according to the settings of

contrast. Refer to section 16.4.10 for more information.

Besides contrast control, BLANK signal plays another role

of turning display off. This is controlled by register bit BLNK

(LCTR). Setting BLNK bit will make BLANK signal to

output “0” to blank the display regardless of contrast control.

Setting BLNK bit will enable the PWM contrast control and

of course the BLANK signal. If LPWMTR[5:0] are all zeros,

BLANK signal will stay at high level with no PWM

modulation.

16.2 Mapping the Display Data

The screen width and height of the LCD panel are

programmable through software. FIGURE 16-1 illustrates

the relationship between the portion of a large graphics file

displayed on the screen and the actual page. Although the

maximum screen size can be up to 1024x512, the actual

supported resolution is limited by the display buffer size,

which is also the internal RAM size, 4K bytes. Each bit in

the display memory corresponds to a pixel in the LCD panel.

FIGURE 16-1 also shows the mapping of the display data

to the LCD.

FIGURE 16-1 LCD Screen Format

16.3 LCD Interface Timing

The LCD controller continuously pumps the pixel data into

the LCD panel via the LCD data bus. The bus is timed by

the CP, LOAD, and FLM signals. Two kinds of data width, 1-

and 4-bit, are supported for most monochrome LCD panels.

Refer to FIGURE 16-2 for both 1- and 4-bit interface timing.

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