ST7920 controller series Chinese character library liquid crystal module manual, introduces the product's hardware characteristics, software characteristics, interface instructions, etc.
The manual describes the ST7920 controller series LCD modules, including their main features such as 33‑line COM output, up to 236×32 dot matrix display, and built‑in Chinese and Latin character ROMs. It explains the hardware characteristics, available interfaces, power‑up reset, internal oscillator and RAM structures.
Detailed sections cover the module’s pin assignments, voltage levels, contrast adjustment circuitry, interface selection (parallel or serial), internal block diagrams, and programming of character, graphics and icon RAM. Electrical specifications such as operating current and voltage thresholds are also provided. This manual is written in Chinese.
| Interface options | 8‑bit parallel, 4‑bit parallel, optional serial |
|---|---|
| DDRAM size | 64 × 16 bits (16 characters × 4 lines) |
| Chinese character ROM | 2 M bits, 8192 characters (16 × 16 dots) |
| Latin character ROM | 126 characters (16 × 8 dots) |
| ICON RAM | 240 dots (15 × 16 bits) |
| Operating current (no backlight) | 1.14 ~ 1.18 mA |
It provides 8‑bit and 4‑bit parallel interfaces and an optional serial interface.
The built‑in Chinese character ROM holds 8192 characters (16 × 16 dot matrix).
Contrast is set by adjusting the V0 voltage with a potentiometer; some modules use a Vout boost circuit, while others tie V0 directly to VCC.