HD66712U
(Dot-Matrix Liquid Crystal Display Controller/Driver)
Description
The HD66712 dot-matrix liquid crystal display controller and driver LSI displays alphanumerics, numbers,
and symbols. It can be configured to drive a dot-matrix liquid crystal display under the control of a serial or
a 4- or 8-bit microprocessor. Since all the functions such as display RAM, character generator, and liquid
crystal driver, required for driving a dot-matrix liquid crystal display are internally provided on one chip, a
minimum system can be interfaced with this controller/driver.
A single HD66712 is capable of displaying a single 24-character line, two 24-character lines, or four 12-
character lines.
The HD66712 software is upwardly compatible with the LCDII (HD44780) which allows the user to easily
replace an LCD-II with an HD66712. In addition, the HD66712 is equipped with functions such as segment
displays for icon marks, a 4-line display mode, and a horizontal smooth scroll, and thus supports various
display forms. This achieves various display forms. The HD66712 character generator ROM is extended to
generate 240 5
×
8 dot characters.
The low-voltage operation (2.7V) of the HD66712, combined with a low-power mode, is suitable for any
portable battery-driven product requiring low power consumption.
Features
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5
×
8 dot matrix possible
Clock-synchronized serial interface capability; can interface with 4- or 8-bit MPU
Low-power operation support:
2.7 to 5.5V (low voltage)
Wide liquid-crystal voltage range: 2.7 to 11.0V max.
Booster for liquid crystal voltage
Two/three times (13V max.)
High-speed MPU bus interface
(2MHz at 5-V operation)
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364
HD66712U
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•
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Extension driver interface
Character display and independent 60-icon mark display possible
Horizontal smooth scroll by 6-dot font width display possible
80
×
8-bit display RAM (80 characters max.)
9,600-bit character generator ROM
240 characters (5
×
8 dot)
64
×
8-bit character generator RAM
8 characters (5
×
8 dot)
16
×
8-bit segment icon mark
96-segment icon mark
34-common
×
60-segment liquid crystal display driver
Programmable duty cycle
(See List 1)
Software upwardly compatible with HD44780
Wide range of instruction functions:
Functions compatible with LCD-II: Display clear, cursor home, display on/off, cursor on/off, display
character blink, cursor shift, display shift
Additional functions: Icon mark control, 4-line display, horizontal smooth scroll, 6-dot character
width control, white-black inverting blinking cursor
Automatic reset circuit that initializes the controller/driver after power on (standard version only)
Internal oscillator with an external resistor
Low power consumption
TCP-128 pin, bare-chip
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List 1 Programmable Duty Cycles
Number
of Lines
1
2
3
5-Dot Font Width
Duty Ratio
1/17
1/33
1/33
Displayed Characters
One 24-character
line
Two 24-character
lines
Four 12-character
lines
Icons
60
60
60
6-Dot Font Width
Displayed Characters
One 20-character
lines
Two 20-character
lines
Four 10-character
lines
Icons
60
60
60
365
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