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Hitachi Semiconductor - 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

Numéro de référence HD66741
Description 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions
Fabricant Hitachi Semiconductor 
Logo Hitachi Semiconductor 





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HD66741 fiche technique
Preliminary
HD66750/1
(128 x 128-dot Graphics LCD Controller/Driver with
Four-grayscale Functions)
Rev 0.7
July 26th, 1999
Description
The HD66750/1, dot-matrix graphics LCD controller and driver LSI, displays 128-by-128-dot graphics
for four monochrome grayscales. Since the HD66750/1 incorporates bit-operation functions and a 16-bit
high-speed bus interface, it enables efficient data transfer and high-speed rewriting of data in the graphics
RAM. The following functions allow the user to easily see a variety of information: a smooth scroll
display function that fixed-displays a part of the graphics icons and perform vertical smooth scrolling of the
remaining bit-map areas, a double-height display function, and a hardware-supported window cursor
display function.
The HD66750/1 has various functions to reduce the power consumption of an LCD system such as low-
voltage operation of 1.8 V min., a booster to generate maximum seven-times LCD drive voltage from the
supplied voltage, and voltage-followers to decrease the direct current flow in the LCD drive bleeder-
resistors. Combining these hardware functions with software functions, such as a partial display with
low-duty drive and standby and sleep modes, allows precise power control. The HD66750/1 is suitable
for any mid-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
¥ 128 ´ 128-dot graphics display LCD controller/driver for four monochrome grayscales
¥ Fixed display of graphics icons (pictograms)
¥ 16-/8-bit high-speed bus interface capability
¥ Bit-operation functions for graphics processing incorporated:
Ñ Write-data mask function in bit units
Ñ Bit rotation function
Ñ Bit logic-operation function
¥ Low-power operation support:
Ñ Vcc = 1.8 to 3.6 V (low voltage)
Ñ VLCD = 5 to 15.5 V (liquid crystal drive voltage)
Ñ Two-, five-, six-, or seven-times booster for liquid crystal drive voltage
Ñ 64-step contrast adjuster and voltage followers to decrease direct current flow in the LCD drive
bleeder-resistors
1

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