ST7093 datasheet(9/43 Pages) SITRONIX

9 / 43 page

ST7093

Ver 2.1

9/43

2003/09/23

Display Data RAM (DDRAM)

Display data RAM (DDRAM) stores display data represented in 8-bit character codes. Its extended capacity is 64

x 8 bits, or 64 characters. The area in display data RAM (DDRAM) that is not used for display can be used as

general data RAM. See Figure 1 for the relationships between DDRAM addresses and positions on the liquid

crystal display.

The DDRAM address (ADD ) is set in the address counter (AC) as hexadecimal.

DDRAM address and corresponding display position

There is 4 line display data stored in DDRAM but only 2 lines are shown at a time. (2 line mode)

Hidden lines can be displayed by issuing line shift instruction.

Figure 1 DDRAM Address

Figure 2 2-Line Mode by 16-Character Display Example

Figure 3 3-Line Mode by 16-Character Display Example

AC AC AC AC AC AC AC

High

Order

bits

Low Order

bits

Example: DDRAM Address 37H

COM1~8

COM9~16

Display

Position

Hidden

09 0A 0B 0C 0D 0E 0F

13 14

19 1A 1B 1C 1D 1E 1F

29 2A 2B 2C 2D 2E

39 3A 3B 3C 3D 3E

COM1~8

COM9~16

Display

Position

COM17~24

Hidden

09 0A 0B 0C 0D 0E 0F

13 14

19 1A 1B 1C 1D 1E 1F

29 2A 2B 2C 2D 2E

39 3A 3B 3C 3D 3E

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