Description
The HD66765, 396-channel segment driver LSI, displays 132RGB-by-176-dot graphics on STN displays in 4096 colors.  It is for driving STN color LCD displays to a maximum of 132RGB by 176 dots, in combination with the HD66764 common driver.  The HD66765’s bit-operation functions, 16- bit high-speed bus interface, and high-speed RAM-write functions enable efficient data transfer and high-speed rewriting of data to the graphics RAM.

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
• Various color-display control functions:
   ― 4,096 out of 13,824 possible colors can be displayed at the same time (grayscale palette
      included)
   ―  Vertical scroll display function in raster-row units
• Low-power operation supports:
   ― Vcc = 1.8 to 3.6 V (low-voltage range)
   ― VLCD = 2.0 to 4.0 V (liquid crystal drive voltage)
   ― Power-save functions such as the standby mode and sleep mode
   ― Partial LCD drive of two screens in any position
   ― Programmable drive duty ratios (1/16–1/176) and bias values (1/4–1/13) displayed on LCD
   ― Maximum 12-times step-up circuit for liquid crystal drive voltage (HD66764)
   ― Voltage followers to decrease direct current flow in the LCD drive bleeder-resistors
      (HD66764)
   ― 128-step contrast adjuster (HD66764)
• Built-in circuit for interfacing with the HD66764 common driver
• Maximum 132RGB-by-176-dot display in combination with the HD66764 common driver
• Internal RAM capacity: 34,848 bytes
• 396-segment liquid crystal display driver
• n-raster-row AC liquid-crystal drive (C-pattern waveform drive)
• Internal oscillation and hardware reset
• Shift change of segment driver