NT7605H-BDT01 Ver la hoja de datos (PDF) - Novatek Microelectronics
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NT7605H-BDT01 Datasheet PDF : 32 Pages
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Functional Description
The NT7605 is a dot-matrix LCD controller and driver LSI. It
operates with either a 4-bit or an 8-bit microprocessor (MPU).
The NT7605 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 as well as controlling the cursor.
Other instructions include reading and writing both data and
addresses. All the 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 NT7605 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 100 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 NT7605
provides 2 CG ROM configurations:
NT7605
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. The character codes
10H to 1FH, 80H to 9FH and 20H all map to null character
patterns. The 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. The 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 coding 5 X 8
dot character patterns is their custom CG ROM.
Custom character patterns are available by
mask-programming the ROM. For convenience of character
pattern development, NOVATEK has developed a
user-friendly editor program for the NT7605 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 can
establish a reliable, fast link for programming the CG ROM.
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