ST7070 Ver la hoja de datos (PDF) - Sitronix Technology Co., Ltd.

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ST7070

Dot Matrix LCD Controller/Driver

Sitronix Technology Co., Ltd. 

ST7070

Display Data RAM (DDRAM)

Display data RAM (DDRAM) stores display data represented in 9-bit character codes. Its extended capacity is 80

x 9 bits, or 80 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.

1-line display (N = 0) (Figure 2)

When there are fewer than 80 display characters, the display begins at the head position. For

example, if using only the ST7070, 8 characters are displayed. See Figure 3.

When the display shift operation is performed, the DDRAM address shifts. See Figure 3.

High Order Low Order

bits

bits

AC AC6 AC5 AC4 AC3 AC2 AC1 AC0

Example: DDRAM Address 4F

1001111

Figure 1 DDRAM Address

Display

Position

123456

(Digit) 00 01 02 03 04 05

DDRAM Address

………………..

78 79 80

4D 4E 4F

Figure 2 1-Line Display

Display

Position

DDRAM

Address

12345678

00 01 02 03 04 05 06 07

For

01 02 03 04 05 06 07 08

Shift Left

For

4F 00 01 02 03 04 05 06

Shift Right

Figure 3 1-Line by 8-Character Display Example

V1.4

9/51

2009/04/29

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