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NT7603H-BDB01

Single-Chip 16C X 2L Dot-Matrix LCD Controller / Driver

Novatek Microelectronics 

Functional Description

The NT7603 is a dot-matrix LCD controller and driver LSI. It

operates with either a 4-bit or an 8-bit microprocessor (MPU).

The NT7603 receives both instructions and data from the

MPU. Some instructions set operation modes, such as the

function mode, data entry mode, and display mode; as well

as some control LCD display functions, such as clear display,

restore display, shift display, and cursor. Other instructions

include reading and writing both data and addresses. All

instructions allow users convenient and powerful functions to

control the LCD dot-matrix displays.

Data is written into, and read from the Data Display RAM (DD

RAM) or the Character Generator RAM (CG RAM). As

display character codes, the data stored in the DD RAM

decodes a set of dot-matrix character patterns that are built

into the Character Generator ROM (CG ROM). The CG

ROM, with many character patterns (up to 256 patterns),

defines the character pattern fonts. The NT7603 regularly

scans the character patterns through the segment drivers.

The CG RAM stores character pattern fonts at run time if

users intend to show character patterns that are not defined

in the CG ROM. This feature makes character display

flexible. Other unused bytes can be used as general-purpose

data storage.

The LCD driver circuit consists of 16 common signal drivers

and 80 segment signal drivers allowing a variety of

application configurations to be implemented.

Character Generator ROM (CG ROM)

The character generator ROM generates LCD dot character

patterns from the 8-bit character pattern codes. The NT7603

provides 2 CG ROM configurations:

NT7603

1. 192 Characters:

The CG ROM contains 160 5 X 8 dot character patterns and

32 5 X 10 dot character patterns. The relation between the

character codes and character patterns is shown in Table 1.

The character codes from 00H to 0FH are used to get

character patterns from the CG RAM. Character codes from

10H to 1FH, from 80H to 9FH and 20H map to null character

patterns. Character codes from E0H to FFH are assigned to

generate 5 X 10 dot character patterns, and other codes are

used to generate 5x8 dot character patterns.

2. 240 Characters:

The CG ROM contains 192 5 X 8 dot character patterns and

48 5 X 10 dot character patterns. The relation between the

character codes and character patterns is shown in Table 2.

The character codes from 00H to 0FH are used to get

character patterns from the CG RAM. Character codes from

10H to 1FH and from E0H to FFH are assigned to generate 5

X 10 dot character patterns, and other codes to generate 5 X

8 dot character patterns. Only one null character pattern

exists in this type. Note that the underlined cursor, displayed

on the 8th duty may be obscure if the 8th row of a dot

character pattern is coded. We recommend that users

display the cursor in the blinking mode if they code 5x8 dot

character patterns as their custom CG ROM.

Custom character patterns are available by

mask-programming ROM. For convenience of character

pattern development, NOVATEK has developed a

user-friendly editor program for the NT7603 to help

determine the character patterns users prefer. By executing

the program on the computer, users can easily create and

modify their character patterns. By transferring the resulting

files generated by the program through a modem or some

other communication method, the user and NOVATEK will

have established a reliable, fast link for programming the CG

ROM.

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