OSD2002-2 datasheet(5/15 Pages) ETC2

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3.4

Display Data RAM (DDRAM)

The Display Data RAM (DDRAM) is used to store the Display Data that is represented

as 8-bit character code. The Display Data RAM supports an extended capacity of 80 x

8-bits or 80 characters.

00 01 02 03 04 05

22 23 24 25 26 27

DDRAM

Address (Hex) 40 41 42 43 44 45

……

…… 62 63 64 65 66 67

To illustrate, for 2-line x 20 characters display, the relationship between the DDRAM

address and position of the PLED panel is shown below.

Display

Position

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13

DDRAM

Address 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53

For shift left

01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14

DDRAM

Address 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54

For shift right

27 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 50 51 52

DDRAM

Address 67 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 50 51 52 53

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