1. Introduction
The ST7787 is a single-chip controller/driver for 262K-color, graphic type TFT-LCD. It consists of 720 source line and 320 gate line driving circuits. This chip is capable of connecting directly to an external microprocessor, and accepts Serial Peripheral Interface (SPI), 8-bits/9-bits/16-bits/18-bits parallel interface. Display data can be stored in the on-chip display data RAM of 240x320x18 bits. It can perform display data RAM read/write operation with no external operation clock to minimize power consumption. In addition, because of the integrated power supply circuits necessary to drive liquid crystal, it is possible to make a display system with the fewest components.

2. Features
• Single chip TFT-LCD controller/driver with display data RAM
• Display resolution: 240(H) x RGB x 320(V)
• Display data RAM (frame memory): 240 x 320 x 18-bits = 1,382,400 bits
• Operation Frequency: DC~30MHz (30MHz for 6 bits, 10MHz for 18 bits)
• Output:
   - 240ch source outputs (240RGB)
   - 320ch gate outputs
   - Common electrode output
• Display mode (color mode)
   - Full color mode (idle mode off): 262K-colors
   - Reduce color mode (idle mode on): 8-colors (1-bit for individual R, G, B color depth)
• Display resolution option
   - 240 x 320 Display with 240 x 18-bits x 320 display RAM
• Supported LC type option
   - MVA LC type (When LCM[1]=0,LCM[0]=0 )
   - Transflective LC type (When LCM[1]=0,LCM[0]=1 )
   - Transmissive LC type (When LCM[1]=1,LCM[0]=0 )
• Supported data format on display host interface
   - 12-bits/pixel: RGB= (444) using the 1382k bits frame memory and LUT
   - 16-bits/pixel: RGB= (565) using the 1382k bits frame memory and LUT
   - 18-bits/pixel: RGB= (666) using the 1382k bits frame memory
• Supported MCU Interface
   - 3-line serial interface
   - 8-bits, 9-bits, 16-bits, 18-bits interface with 8080-series MCU
   - 8-bits, 9-bits, 16-bits, 18-bits interface with 6800-series MCU
   - 6-bits, 16-bits, 18-bits RGB interface with graphic controller
• Display features
   - Area scrolling
   - Partial display mode
   - Software programmable color depth mode
• Build-in circuit
   - DC/DC converter
   - Adjustable VCOM generation
   - Non-volatile (NV) memory to store initial register setting
   - Oscillator for display clock generation
   - Timing controller
   - 4 preset gamma curve for γ=1.0/1.8/2.2/2.5 (supporting Transflective) and 1 preset gamma curve for γ=2.2
(supporting MVA, Ttransmissive type LC)
   - Factory default value (contrast, module ID, module version, etc) are stored in NV memory
   - Line inversion, frame inversion
• NV Memory
   - 8-bits for ID1
   - 7-bits for ID2
   - 8-bits for ID3
   - 8-bits for VCOM adjustment
• Supply voltage range
   - Analog supply voltage range (VDD to AGND): 2.45V – 3.3V
   - I/O supply voltage range (VDDI to DGND): 1.65V – 3.3V
• Output voltage level
   - Source output voltage range (GVDD to AGND): 3.0V to 5.0V
   - Power supply range for driver circuit (AVDD to AGND): 5.2V (VDD=2.6V) to 6.0V (VDD=3.0V)
   - Output range of HIGH level of VCOM (VCOMH to AGND): 2.5V to 5.0V
   - Output range of LOW level of VCOM (VCOML to AGND): -2.5V to 0.0V
   - Output range of HIGH level of gate driver (VGH to AGND): +12V to +16.5V
   - Output range of LOW level of gate driver (VGL to AGND): -14V to –5V
• Lower power consumption, suitable for battery operated systems
   - CMOS compatible inputs
   - Optimized layout for COG assembly
   - Operate temperature range: -30 to + ℃ 70℃