UPD6466GS datasheet(52/70 Pages) NEC

52 / 70 page

µPD6466

5. CHARACTER PATTERNS

The

µPD6466 can display 512 character patterns, including alphanumeric characters, Kanji characters, and

symbols, which are stored in the character generator ROM. Each pattern in the character generator ROM can be

modified by specifying a mask code option. However, the Display Off Data at character address FEH and 2-byte

continuous command end code at FFH cannot be modified because they are fixed in both high-order (1) and low-order

(0) banks. Therefore, no character pattern can be input at these addresses.

When none of the 12

× 18 dots are filled for a character pattern at addresses 000H to 0FDH and 100H to 1FDH,

the character pattern is called Blank Data. Character address FEH in both banks is called Display Off Data. Blank

Data and Display Off Data are represented in the same way (with no dots filled) in character patterns (of the

µPD6466GS-001) shown on the following pages, but they are different as follows:

Character Code

Display of Character Area in Each Background Mode

No background

Minimum background

Overall background

Blank Data

Displays image

Displays background

Display Off Data

Displays image

Displays image only

(without background)

You cannot specify Display Off Data for addresses other than FEH when using a mask code option. Blank Data,

however, can be specified at any address from 000H to 0FDH or 100H to 1FDH (address 0FFH and 1FFH cannot

be used because they are fixed to the 2-byte continuous command end code).

The character patterns of the

µPD6466GS-001/GT-201 (NEC’s standard model) are shown on the following pages.

UPD6466GS Datasheet(PDF) 52 Page - NEC