This application manual introduces the RA8803/8822 dual-layer Chinese character/graphic LCD controller's interface and application circuit, including microcontroller (MPU) interface, LCD driver interface, Chinese character ROM and LCD display brightness adjustment.
The RA8803/8822 is a dual‑layer LCD controller that supports Chinese and graphic display modes on panels up to 320×240 or 240×160 pixels. It includes a 512 KB built‑in font ROM and can operate with either 8080 or 6800 MPU interfaces, selectable via the SYS_MI pin.
The document covers MPU interface wiring, LCD driver connections, font ROM usage, brightness adjustment, touch‑panel integration, system clock settings, initial hardware/software configuration, and a full set of application examples and circuit diagrams. Appendices provide power‑supply designs, driver compatibility tables, debugging flowcharts, and C51 example programs. This manual is written in Chinese.
| Maximum LCD resolution | 320×240 or 240×160 pixels |
|---|---|
| Built‑in font ROM size | 512 KB |
| System clock | 8 MHz |
| Operating voltage | 3.3 V |
It supports panels up to 320×240 or 240×160 pixels.
The SYS_MI pin, with a pull‑low resistor selects 8080 mode and a pull‑high resistor selects 6800 mode.
Brightness is controlled via a DAC circuit as described in the brightness adjustment section.