GMD1621B データシートの表示（PDF） - Unspecified

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GMD1621B

Stanley dot matrix character type LCD module

Unspecified 

GMD1620B

GMD1621B

RELATIONSHIP BETWEEN CG RAM ADDRESS AND CHARACTER CODE (DD RAM DATA) TO CHARACTER PATTERN (CG RAM DATA)

NOTES

1. Character code bits 0‑2 correspond to CGRAM address bits 3‑5 (3bits: 8 characters).

2. CGRAM address bits 0‑2 designate character pattern line position. The 8th line is

the cursor position and display is performed in logical OR the cursor.

Maintain the 8th line data, corresponding to the cursor display position in the “0”,

state for cursor display. When the 8th line data is “1”, bit 1 lights up regardless

of cursor existence.

3. Character pattern row positions correspond to CGRAM data bits 0‑4, as shown in the

figure (bit 4 being at the left end).

Since CGRAM data bits 5‑7 are not used for display, these can be used for the general

data RAM.

4. As shown in the table above, the CGRAM character patterns are selected when character

code bit 4‑7 are all ”0”. However, since character code bit 3 is an ineffective bit,

the “R” display in the character pattern example, is selected by character code “00”

(hexadecimal) or “08”(hexadecimal).

5. “1” for CGRAM data corresponds to selection for display and “0” for no selection.

2005.05.25

Page.9

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