PC0801ARS-F datasheet(33/65 Pages) POWERTIP

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ST7066U

V2.0

2001/03/01

10/42

#" 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 ST7066U, 8 characters are displayed. See Figure 3.

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

Figure 1 DDRAM Address

Figure 2 1-Line Display

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

ST7066U is used, 8 characters

× 2 lines are displayed. See Figure 5.

AC6 AC5 AC4 AC3 AC2 AC1 AC0

High Order

bits

Low Order

bits

Example: DDRAM Address 4F

DDRAM Address

………………..

Display

Position

(Digit)

DDRAM

Address

Display

Position

For

Shift Left

For

Shift Right

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