ST7066 Просмотр технического описания (PDF) - Unspecified

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производитель

ST7066

Dot Matrix LCD Controller/Driver

Unspecified 

ST7066

Display Data RAM (DDRAM)

Display data RAM (DDRAM) stores display data represented in 8-bit character codes. Its extended capacity is 80 x 8

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 ST7066, 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

………………..

Figure 2 1-Line Display

78 79 80

4D 4E 4F

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

!" 2-line display (N = 1) (Figure 4)

Case 1: When the number of display characters is less than 40 × 2 lines, the two lines are displayed from the head. Note that

the first line end address and the second line start address are not consecutive. For example, when just the ST7066 is

used, 8 characters × 2 lines are displayed. See Figure 5.

V1.2

7

2000/6/13

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