NT7603BDW-01 Ver la hoja de datos (PDF) - Novatek Microelectronics
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NT7603BDW-01 Datasheet PDF : 25 Pages
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NT7603
Functional Description
The NT7603 is 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 read and write 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:
1. 192 Characters:
The CG ROM contains 160 5 X 8 dot character patterns and
32 5 X 10 dot character patterns, which 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 and from 80H to 9FH map to full 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, which 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. No 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 is 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 have
established a reliable, fast link for programming the CG
ROM.
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