HD66764

` 132RGB x 176-dot graphics display LCD controller/driver for 4,096 STN colors (when HD66764is 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 paletteincluded)
    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 (1/161/176) and bias values (1/41/13) 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

The HD66765, 396-channel segment driver LSI, displays 132RGB-by-176-dot graphics on STNdisplays in 4096 colors. It is for driving STN color LCD displays to a maximum of 132RGB by 176dots, 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 andhigh-speed rewriting of data to the graphics RAM.The HD66765 and HD66764 have various functions for reducing the power consumption of an LCDsystem. The HD66765 has a low-voltage operation (1.8 V min.) and an internal RAM to display amaximum of 132RGB-by-176-dot color, and the HD66764 has a step-up circuit to generate the LCDdrivevoltage, a bleeder resistor for the drive interface with the LCD, and voltage-followers. Since theHD66765 incorporates a circuit that interfaces with the HD66764, it can set instructions for theHD66764. In addition, precise power control can be achieved by combining these hardware functionswith software functions, such as a partial display that only requires a low drive-voltage duty, andstandby and sleep modes. This LSI is suitable for any medium-sized or small portable battery-drivenproduct requiring long-term driving capabilities, such as digital cellular phones supporting a WWWbrowser, bidirectional pagers, and small PDAs.