HD66765 Datasheet, PDF (1/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

—PRELIMINARY—
HD66765
396-channel Segment Driver with Internal RAM for 4096-color
Displays
n _{Target Specification}
tio ^Rev.0.1
January, 2001
cifica _Description
pe _{The HD66765, 396-channel segment driver LSI, displays 132RGB-by-176-dot graphics on STN}
S _{displays in 4096 colors. It is for driving STN color LCD displays to a maximum of 132RGB by 176}
y ^{dots, in combination with the HD66764 common driver. The HD66765’s bit-operation functions, 16-}
r _{bit high-speed bus interface, and high-speed RAM-write functions enable efficient data transfer and}
a _{high-speed rewriting of data to the graphics RAM.}
in _{The HD66765 and HD66764 have various functions for reducing the power consumption of an LCD}
lim ^{system. The HD66765 has a low-voltage operation (1.8 V min.) and an internal RAM to display a}
maximum of 132RGB-by-176-dot color, and the HD66764 has a step-up circuit to generate the LCD-
e drive voltage, a bleeder resistor for the drive interface with the LCD, and voltage-followers. Since the
r _{HD66765 incorporates a circuit that interfaces with the HD66764, it can set instructions for the}
P _{HD66764. In addition, precise power control can be achieved by combining these hardware functions}
with software functions, such as a partial display that only requires a low drive-voltage duty, and
standby and sleep modes. This LSI is suitable for any medium-sized or small portable battery-driven
product requiring long-term driving capabilities, such as digital cellular phones supporting a WWW
browser, bidirectional pagers, and small PDAs.
Features
• 132RGB x 176-dot graphics display LCD controller/driver for 4,096 STN colors (when HD66764
is used)
• Low-voltage drive and flickerless PWM grayscale drive
• 16-/8-bit high-speed bus interface and serial peripheral interface (SPI)
• High-speed burst-RAM write function
• Writing to a window-RAM address area by using a window-address function
• Bit-operation functions for graphics processing:
 Write-data mask function in bit units
 Logical operation in pixel unit and conditional write function