640x240, 320x480 Two Layer Graphic / Character LCD controller
General Description
RA8806 is a LCD controller for Dot-Matrix type STN-LCD which supports both character and graphic mode display. The RA8806 has built-in two Display Data RAM(DDRAM) for two layers display, and has an embedded font ROM which is capable of displaying the full-size(16x16 pixels) traditional Chinese font(BIG5, 13973 characters) or simplified Chinese font(GB, 9216 characters). RA8806 also contains 4x256 embedded half-size (8x16 pixels) characters that can display ISO8859-1 ~ 4(or called Latin-1 ~ 4) alphabets using at most of English speaking and Europe countries.
RA8806 supports 8080/6800 MPU protocol interface, which is capable of switching the interface with 4-bits or 8-bits data bus. For LCD driver interface, it can be set to 4-bits/8-bits data bus. The maximum resolution of RA8806 is 320x240 pixels in normal mode, and 640x240 or 320x480 pixels in extension mode. By using the font rotation mode, which can implement the “vertical” font display. The embedded intelligence touch panel controller provides the 4-wires resistance-type Touch Panel interface. The PWM output provides an easy contrast or back-light control method for LCD panel. RA8806 also provides a 4x8(32 keys) or 8x8(64 keys) powerful and smart Key-Scan interface includes long-key function. The flexible interrupt and polling mechanism can make it easy to control touch panel, key-scan and power mode functions. Also it can greatly reduce the MPU loading. The embedded 512Byte character generation RAM (CGRAM) allows user to build maximum 16 full-size or 32 half-size fonts. Even with the single layer display, the other unused layer can be used as CGRAM too. In this setting, the amazing 300 full-size and 600 half-size user created fonts or symbols are supported.
In addition, RA8806 supports 4 gray scale display in FRC mode. The bit-arrangement is compatible for most gray level picture and easy to program. RA8806 also includes many useful functions, like area scroll, font blinks/bold/enlargement, memory clear function and so on. An innovative mechanism of “no-flicker” mode is provided in RA8806. It's effective for removing the “flicker” in frequently display data R/W. User can easily improve the display quality by RA8806.
RA8806 is a powerful and flexible LCD controller. It provides the total solution for the middle-size mono LCD controller. User can save large amount of time for system development and the cost of hardware system.
Feature (RoHS Compliance)
Support text and graphics Mode
Maximum resolution: 320x240 with 2-Layers overlay display (AND, OR, NOR and XOR)
Extension Mode: 640x240 or 320x480 with single layer
Support 4/8-bit of 6800/8080 MPU interface and 4/8-bits driver interface
Built-In smart 8x8 or 4x8 key-scan circuit with programmable long key function
Support horizontal and vertical area scrolling
Built-In GB/BIG5 and ASCII Font ROM
Support 90° , 180 °, 270° font and display rotation
Support Font enlargement (x1~x4 in Horizontal and Vertical direction)
